THE SKELETAL SYSTEM. Focus on the Skull
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1 THE SKELETAL SYSTEM Focus on the Skull
2 Review Anatomical Terms Anterior/Posterior Dorsal/Ventral Medial/Lateral Superior/Inferior
3 Bone Markings - Review Projections for attachment of muscles, ligaments and tendons (Process, trochanter, tuberosity, tubercle, crest, line, spine) Processes for articulation with other bones (Head, neck, condyle, trochlea, facet) Openings = holes or spaces in bone for nerves and vessels to pass (Foramen, canal, meatus, fissure, sinus) Depressions = indentations (Fossa, sulcus)
4 Axial Skeleton Includes bones of the skull, vertebral column and thoracic cage Creates a framework of support and protection for internal organs Provides sites of attachment of muscles
5 The Skull Protects the brain and supports delicate sense organs Bones that form the skull include 8 cranial bones 14 facial bones 6 auditory ossicles (tiny bones in the ears) Hyoid bone (the only freely moveable bone) Bones are joined by sutures
6 Bones of the Cranium Frontal bone (1)- forms the forehead and roof of the ocular orbits Parietal Bone (2) posterior to the frontal bone; forms the sides and roof of skull Occiptal Bone (1) most posterior part of the cranium foramen magnum = large opening for spine Temporal Bone (2) form the sides and base of the skull; a number of distinct anatomical landmarks
7 Sutures of the Cranium Sagittal Suture midline suture; between parietal bones Coronal Suture between frontal bone and parietal bones Lambdoid Suture between occipital and parietal bones Squamous Suture between the temporal bones and the parietal bones
8 Bones and Sutures of the Cranium Lateral View Coronal Suture Parietal Bone Frontal Bone Temporal Bone Lambdoid Suture Squamous Suture Occipital Bone
9 Bones and Sutures of the Cranium Frontal View Coronal Suture Parietal Bone Frontal Bone Temporal Bone
10 Bones and Sutures of the Cranium Inferior View Temporal Bone Parietal Bone Occipital Bone
11 Bones and Sutures of the Cranium Horizontal View Frontal Bone Temporal Bone Parietal Bone Occipital Bone REVIEW
12 The skull at birth
13 The skull at birth
14 Bones of the Cranium continued Sphenoid Bone irregular bat-shaped bone forms part of the cranial floor Ethmoid Bone stabilizes the brain; forms the roof and sides of the nasal cavity Vomer nasal septum Palatine Bone posterior hard palate ( roof of mouth )
15 Bones of the Cranium Lateral View Coronal Suture Parietal Bone Temporal Bone Lambdoid Suture Squamous Suture Occipital Bone Frontal Bone Sphenoid Bone Ethmoid Bone
16 Bones of the Cranium - Frontal Coronal Suture Parietal Bone Frontal Bone Sphenoid Bone Ethmoid Bone Temporal Bone Vomer
17 Bones of the Cranium Inferior View Palatine Bone Sphenoid Bone Vomer Temporal Bone Parietal Bone Occipital Bone
18 Bones of the Cranium Horizontal View Frontal Bone Sphenoid Bone Ethmoid Bone Temporal Bone Parietal Bone Occipital Bone
19 Facial Bones Maxilla (2) anterior part of hard palate; upper jaw; articulates with all other facial bones except the mandible Zygomatic Bones (2) cheek bones Nasal Bones bridge of nose Lacrimal Bones tiny bones bearing tear ducts Mandible lower jaw
20 Bones of the Face Lateral View Coronal Suture Parietal Bone Temporal Bone Lambdoid Suture Squamous Suture Occipital Bone Frontal Bone Sphenoid Bone Ethmoid Bone Lacrimal Bone Nasal Bone Zygomatic Bone Maxilla Mandible
21 Bones of the Face - Frontal Coronal Suture Parietal Bone Frontal Bone Nasal Bone Sphenoid Bone Ethmoid Bone Lacrimal Bone Zygomatic Bone Maxilla Mandible Temporal Bone Vomer
22 Bones of the Face Inferior View Maxilla Palatine Bone Zygomatic Bone Maxilla Sphenoid Bone Vomer Temporal Bone Parietal Bone Occipital Bone
23 Teeth (32) Incisors Canines Pre-molars Molars Pre-molars Canines Incisors
24 Processes Any elevation or projection Can be part of a joint or a site of attachment for muscles, ligaments and tendons
25 Processes of the cranium Styloid process (temporal bone) Mastoid process (temporal bone) Zygomatic process (temporal bone) Occipital condyle (occipital bone) External occipital protuberance (occipital bone) Coronoid process (mandible) Condylar process (mandible) Mandibular process (mandible) Pterygoid process (sphenoid) Hamulus of the pterygoid process (sphenoid) PROCESS Protrusion for attachment of tendons and ligaments
26 Styloid Process Pointed piece of bone that extends down from the temporal bone just below the ear Attaches to ligaments that support the hyoid bone muscles that control the tongue and pharynx
27 Mastoid Process Built up area of the lower temporal bone where important neck muscles attach Muscle that rotate and elevate the head and clavicle attach here
28 Zygomatic Process of the Temporal Bone Connects temporal bone to facial bones (zygomatic bone)
29 Occipital Condyle The site on the occipital bone where skull meets vertebrae Atlas = the first vertebrae in the spinal column
30 External Occipital Protuberance Medial protrusion of the occipital bone Muscles that keep the head upright and allow the head to tilt backward attach here
31 Coronoid Process (coronation day) like a crown Attachment point for muscle that closes the jaw
32 Condylar Process Forms a hinge with the temporal bone
33 Mandibular Process Smooth surface of the condylar process
34 The Sphenoid Bone Pterygoid Process and the hamulus of the pterygoid process
35 Process of the Skull Lateral View Coronal Suture Parietal Bone Temporal Bone Lambdoid Suture Squamous Suture Occipital Bone Zygomatic Process Frontal Bone Sphenoid Bone Ethmoid Bone Lacrimal Bone Nasal Bone Zygomatic Bone Maxilla Mastoid Process Styloid Process Mandible
36 Process of the Skull - Frontal Coronal Suture Parietal Bone Frontal Bone Nasal Bone Sphenoid Bone Ethmoid Bone Lacrimal Bone Zygomatic Bone Maxilla Mandible Temporal Bone Ethmoid Bone Vomer
37 Process of the Skull Inferior View Maxilla Palatine Bone Zygomatic Bone Zygomatic Process Maxilla Sphenoid Bone Vomer Styloid Process Mastoid Process Temporal Bone Occipital Condyle Parietal Bone Occipital Bone
38 Processes of the Skull Horizontal View Frontal Bone Sphenoid Bone Ethmoid Bone Temporal Bone Parietal Bone Occipital Bone
39 Name the Process
40 Name the Process
41 Foramina and Other Structures General terms to describe openings include Foramen, canal, meatus, fissure sinus
42 Foramina and Other Structures Supraorbital foramen (frontal) Infraorbital foramen (maxilla) Mental foramen (mandible) Foramen magnum (occipital) Jugular foramen (temporal) Carotid canal (temporal) External acoustic meatus (temporal) Mandibular foramen (mandible) Palatine foramen (palatine) Foramen lacerum (temporal) Foramen ovale (sphenoid) Foramen spinosum (sphenoid) Foramen rotundum (sphenoid) Stylomastoid foramen (temporal) FORAMEN, MEATUS, FISSURE, CANAL: Terms to describe openings for passage of nerves and blood vessels
43 Supraorbital foramen** above the orbit blood vessels and nerves that innervate the eyebrows and eyelids
44 Infraorbital foramen** below the orbit Facial nerves
45 Mental foramen** Distal/lateral opening for the mental nerve and vessels that innervate the lip
46 Mandibular foramen Proximal/medial opening for the mental nerve and vessels that innervate the lip and teeth
47 Palatine foramen Nerves that innervate the palate
48 External Auditory meatus** Opening that leads to the eardrum (tympanum)
49 Foramen magnum** Spinal cord
50 Jugular foramen** Jugular vein
51 Carotid Canal** Carotid artery
52 Foramen ovale** Trigeminal nerve mandibular branch
53 Foramen spinosum Nerves that innervate the meninges enter the brain
54 Foramen lacerum Fills with cartilage after birth
55 Foramen rotundum Trigeminal nerve: maxillary branch
56 Stylomastoid foramen Facial nerves exit skull
57 Foramina of the Skull Lateral View Coronal Suture Parietal Bone Temporal Bone Lambdoid Suture Squamous Suture Occipital Bone Zygomatic Process External Auditory Meatus Mastoid Process Styloid Process Mandible Frontal Bone Sphenoid Bone Ethmoid Bone Lacrimal Bone Nasal Bone Zygomatic Bone Maxilla Mandible Mental Foramen
58 Foramina of the Skull - Frontal Coronal Suture Parietal Bone Nasal Bone Sphenoid Bone Ethmoid Bone Lacrimal Bone Zygomatic Bone Maxilla Mandible Frontal Bone Supraorbital Foramen Superior Orbital Fissure Optic Canal Temporal Bone Infraaorbital Foramen Ethmoid Bone Vomer
59 Foramina of the Skull Inferior View Maxilla Palatine Bone Zygomatic Bone Zygomatic Process Vomer Styloid Process Mastoid Process Temporal Bone Parietal Bone Occipital Bone Maxilla Sphenoid Bone Foramen Ovale Carotid Canal Jugular Foramen Occipital Condyle Foramen Magnum
60 Foramina of the Skull Horizontal View Frontal Bone Sphenoid Bone Ethmoid Bone Optic Canal Temporal Bone Carotid Canal Foramen Ovale Jugular Foramen Parietal Bone Occipital Bone Foramen Magnum
61 Other Features Superior Nuchal Line Inferior Nuchal Line Mandibular foss
62 THE SKELETAL SYSTEM Continue with the vertebrae
63 Vertebral Column Consists of 26 bones 24 vertebrae Sacrum Coccyx Vertebrae separated by cartilage (intervertebral discs) Subdivided based on vertebral structure
64 Vertebrae Anatomy - general Vertebral body massive weight bearing portion Vertebral foramen the opening through which the spinal cord passes Articular processes extensions of the vertebrae that articulate with other bones or provide attachment for muscles Transverse processes Superior articular processes Inferior articular processes
65 Vertebrae Anatomy - General
66 Vertebrae Anatomy by region
67 Cervical Region Seven cervical vertebrae (C1 to C7) The first cervical vertebrae (C1; atlas) articulates with the occipital condyle
68 Cervical region Anatomical Features oval concave body large vertebral foramen Stumpy spinous process with a notched tip Transverse foramina within the transverse processes Protect blood vessels supplying the brain
69 Cervical Vertebrae Anatomy
70 Cervical region Vertebral Foramen Vertebral Arch Spinous Process Lamina Superior Articular Processes Pedicle Superior Articular Facet Transverse Process Transverse Foramen Body
71 Cervical region The first two cervical vertebrae have unique characteristics C1 = ATLAS ( yes) Articulation of atlas with skull allows you to nod your head C2 = AXIS ( no ) Articulation of atlas and axis allows you to rotate your head
72 The Atlas and Axis Dens (odontoid process) Ligament Articulates with occipital condyles Atlas (C1) Articulates with atlas Axis (C2)
73 Thoracic Region Twelve cervical vertebrae (T1 to T12) Each thoracic vertebrae articulates with one or more pairs of ribs
74 Thoracic region Vertebrae Anatomy Heart shaped body More massive than cervical vertebrae Large, slender spinous processes that point inferiorly Costal facets for articulating with one or more pairs of ribs
75 Vertebral Anatomy thoracic region Spinous Process Transverse Process Lamina Vertebral Arch Pedicle Articular facets Pedicle Articular facets Vertebral Foramen Body
76 Lumbar Region Five lumbar vertebrae (L1 to L5) The fifth lumbar vertebrae articulates with the sacrum
77 Lumbar region Vertebrae Anatomy Vertebral body is thick and more oval than thoracic Massive, stumpy spinous process that projects posteriorly Bladelike transverse processes; no articulation for ribs Most massive, least mobile
78 Vertebral Anatomy lumbar region Spinous Process Vertebral Foramen Lamina Articular facets Transverse Process Pedicle Body
79 Sacrum Region sacrum Single bone formed by the fusion of 5 embryonic vertebrae
80 Sacrum Protects reproductive, digestive and excretory organs Attaches the axial skeleton to the appendicular skeleton Broad surface attachment of leg muscles Bones fuse shortly after puberty Prominent bulge (sacral promontory) is an important landmark in females during labor and delivery
81 Coccyx Coccyx Series of small fused vertebrae
82 Coccyx Attachment site for muscle that closes that anal opening Fusion of the bone is not complete until late in adulthood May eventually fuse with the sacrum
83 Normal Spinal Curvature Four spinal curves (seen in lateral view) Primary curves Thoracic and sacral curves Appear late in fetal development Secondary curves Cervical curve as baby holds head up Lumbar curve as baby learns to stand
84 Normal Spinal Curvature
85 Spinal curvature development Cervical curvature develops as a baby learns to hold its head
86 Spinal curvature development Lumbar curvature develops as a baby learns to stand
87 Abnormal spinal curvature Several abnormal conditions can arise during childhood and adolescence Kyphosis exaggerated thoracic curvature Lordosis exaggerated lumbar curvature Scoliosis abnormal lateral curvature
88 Kyphosis
89 Lordosis
90 Scoliosis
91 THE SKELETAL SYSTEM Continue with the Thoracic Cage
92 Thoracic Cage Consists of the thoracic vertebrae, the ribs and the sternum Ribs + sternum = rib cage Provides bony support for the walls of the thoracic cavity Protects heart and lungs Serves as base for muscles involved in respiration
93 Ribs AKA costal bones Elongated flattened bones 12 pairs Ribs 1-7 = true ribs attach to the sternum by separate cartilage extensions Ribs 8-10 = false ribs; do not attach directly to the sternum; cartilages fuse before attachment Ribs = floating ribs; do not connect to sternum at all
94 Sternum AKA breastbone 3 parts 1. Manubrium = Broad triangular part articulates with clavicle 2. Elongated body articulates with ribs 3. Ziphoid process Damage to this process can puncture the liver CPR training places special emphasis on location of this part of the sternum to reduce damage during compressions
95 Floating Ribs Thoracic vertebrae True Ribs Manubrium Body Sternum Ziphoid Process Ribs False Ribs Costal Cartilage
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