AXIAL SKELETON SKULL
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1 AXIAL SKELETON SKULL
2 CRANIAL BONES (8 total flat bones w/ 2 paired)
3 1. Frontal forms forehead & upper portion of eyesocket (orbital)
4 2. Parietal paired bones; form superior & lateral walls of cranium
5 3. Temporal paired bones; inferior to parietal bones A. External auditory meatus canal leading to eardrum & middle ear B. Styloid process sharp projection below meatus; attachment of neck & tongue muscles
6 C. Zygomatic process bridge of bone that joins with cheekbone D. Mastoid process rough projection inferior & posterior to meatus (feel behind ears); attachment of neck muscles
7 E. Jugular foramen found at junction of occipital & temporal bones; opening for jugular vein F. Carotid canal superior to jugular foramen; passage for carotid artery
8 4. Occipital Bone most posterior bone; forms base of skull A. Foramen magnum large opening for passage of spinal cord B. Occipital condyles lateral to foramen magnum; projections that rest on 1 st cervical vertebrae
9 5. Sphenoid butterfly shaped; spans entire width of skull
10
11 SPHENOID
12 A. Sella turcica Turk s saddle ; depression that holds the pituitary gland B. Foramen ovale large oval opening at posterior end of sella turcica; passage of cranial nerves that control chewing
13 Sella turcica Foramen ovale
14 6. Ethmoid irregular bone anterior to sphenoid Forms roof of nasal cavity & part of medial walls of orbitals A. Cristi galli cock s comb ; projection on superior surgace to which outermost brain attaches B. Cribiform plates holey areas on each side of cristi galli; passage of olfactory nerves
15
16
17 1. Frontal bone 2. Ethmoid bone 3. Palatine bone 4. Zygomatic bone 5. Lacrimal bone 6. Maxillary bone
18 SUTURES OF SKULL (immovable joints of skull bones) 1. Coronal between frontal & parietal bones 2. Sagittal between paired parietal bones 3. Lamboidal between parietal & occipital bones 4. Squamosal between parietal & temporal bones
19 1 Coronal 5 Squamosal 9 lamboidal 15 - sagittal
20 FETAL SKULL Contains cartilage filled spaces called fontanels that allow for brain growth & compression during birth Face is smaller in comparison to cranium Adult s cranium 1/8 of total body length Infant s cranium ¼ of total body length Frontal bones split Temporal bone is a ring of bone Conical projections present growth areas
21
22 1. Frontal (anterior) between parietal & frontal bones; diamond shaped; largest; closes within months 2. Occipital (posterior) between parietal & occipital bones; closes within 2 months FONTANELS
23 3. Sphenoidal (anterolateral) paired; at the junction of the frontal, parietal, temporal & sphenoid bones ; closes within 3 months 4. Mastoid - (posterolateral); at the junction of parietal, occipital & temporal bones
24 FACIAL BONES (14 bones w/ 2 being paired) 1. Maxillae 2 bones that fuse to form the upper jaw All facial bones except mandible join to maxillae
25 A. Alveolar margin (process) holds teeth B. Palantine process anterior hard palate
26 2. Palatine Bones posterior to palatine processes of maxillae If not fused cleft palate results
27
28 3. Zygomatic Bones cheekbones
29 4. Lacrimal Bones smallest facial bone; forms most of the medial walls of the orbits
30 1. Frontal bone 2. Ethmoid bone 3. Palatine bone 4. Zygomatic bone 5. Lacrimal bone 6. Maxillary bone
31 5. Nasal Bones form the bridge of the nose 6. Vomer Bone plow shaped ; single bone in the median of nasal cavity 7. Conchae scroll shaped ; form
32 Nasal bones conchae vomer
33 8. Mandible lower jaw; only free moving joint of skull A. Body horizontal; chin B. Rami perpendicular uprights C. Angle where body meets rami D. Coronoid process spine like process; anterior
34 E. Condylar process knob like process; posterior; forms temporal mandibular joint F. Mandibular notch depression between processes G. Mandibular foramen opening on inner surface of rami H. Mental foramen opening on body
35 HYOID BONE U shaped Only bone that doesn t directly articulate with any other bone in body Located above the larynx ; suspended from styloid process 3 parts: Greater cornua superior Lesser cornua inferior Body anterior
36 Greater cornua Lesser cornua
37 OSSICLES Bones of inner ear Incus anvil Malleus hammer Stapes - stirrup
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