Chapter 7 The Skeletal System:The Axial Skeleton
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1 Chapter 7 The Skeletal System:The Axial Skeleton Axial Skeleton 80 bones lie along longitudinal axis skull, hyoid, vertebrae, ribs, sternum, ear ossicles Appendicular Skeleton 126 bones upper & lower limbs and pelvic & pectoral girdles 5 basic types of bones: long = compact short = spongy except surface flat = plates of compact enclosing spongy irregular = variable sesamoid = develop in tendons or ligaments (patella) Sutural bones = in joint between skull bones Types of Bones Bone Surface Markings Surface features-- rough area, groove, openings, process Specific functions passageway for blood vessels and nerves joint formation muscle attachment & contraction Bone Surface Markings from Table 7.2 Foramen = opening Fossa = shallow depression Sulcus = groove Meatus = tubelike passageway or canal Condyle = large, round protuberance Facet = smooth flat articular surface Trochanter = very large projection Tuberosity = large, rounded, roughened projection Learning the terms found in this Table will simplify your study of the skeleton.
2 The Skull Sutures 8 Cranial bones protect brain & house ear ossicles muscle attachment for jaw, neck & facial muscles 14 Facial bones protect delicate sense organs -- smell, taste, vision support entrances to digestive and respiratory systems Coronal suture unites frontal and both parietal bones Squamous suture unites parietal and temporal bones Fontanels of the Skull at Birth. Dense connective tissue membrane-filled spaces (soft spots) Unossified at birth but close early in a child's life. Fetal skull passes through the birth canal. Rapid growth of the brain during infancy Foramina of the Skull Table 7.3 p.201 describes major openings of skull In which bone would you find the following and what is their function? foramen magnum Brain stem optic foramen Cranial (optic) nerve mandibular foramen Nerve and blood vessels carotid canal Carotid artery & nerves stylomastoid foramen Cranial nerve VII & stylomastoid artery
3 Hyoid Bone U-shaped single bone Articulates with no other bone of the body Suspended by ligament and muscle from skull Supports the tongue & provides attachment for tongue, neck and pharyngeal muscles Vertebral Column Backbone or spine built of 26 vertebrae Five vertebral regions cervical vertebrae (7) in the neck thoracic vertebrae ( 12 ) in the thorax lumbar vertebrae ( 5 ) in the low back region sacrum (5, fused) coccyx (4, fused) Intervertebral Discs Normal Curves of the Vertebral Column Between adjacent vertebrae absorbs vertical shock Permit various movements of the vertebral column Primary curves thoracic and sacral are formed during fetal development Secondary curves cervical is formed when infant raises head at 4 months lumbar forms when infant sits up & begins to walk at 1 year Fibrocartilagenous ring with a pulpy center
4 Sacrum Coccyx Union of 5 vertebrae (S1 - S5) by age 30 median sacral crest was spinous processes sacral ala is fused transverse processes Sacral canal ends at sacral hiatus Union of 4 vertebrae (Co1 - Co4) by age 30 Caudal or epidural anesthesia during delivery into sacral hiatus anesthetize sacral & coccygeal nerves sacral and coccygeal cornu are important landmarks Auricular surface & sacral tuberosity of SI joint Thorax Bony cage flattened from front to back Sternum (breastbone) Ribs 1-7 are true ribs (vertebrosternal) 8-12 are false ribs (vertebrochondral) are floating Costal cartilages Bodies of the Sternum Manubrium 1st & 2nd ribs clavicular notch Body costal cartilages of 2-10 ribs Xiphoid ossifies by 40 CPR position abdominal mm. Sternal puncture biopsy thoracic vertebrae.
5 Ribs Rib Articulation Fracture at site of greatest curvature. Increase in length from ribs 1-7, thereafter decreasing Head and tubercle articulate with facets Body with costal groove containing nerve & blood vessels Intercostal spaces contain intercostal muscles Tubercle articulates with transverse process Head articulates with vertebral bodies Protrusion of the nucleus pulposus Most commonly in lumbar region Pressure on spinal nerves causes pain Surgical removal of disc after laminectomy Herniated (Slipped) Disc Clinical Problems Abnornal curves of the spine. scoliosis (lateral bending of the column) kyphosis (exaggerated thoracic curve) lordosis (exaggerated lumbar curve) Spina bifida is a congenital defect failure of the vertebral laminae to unite nervous tissue is unprotected paralysis
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