Module 7: The Skeleton and Joints Flashcards
Axial Skeleton
80 Bones Skull Vertebrae Ribs Hyoid bone Sternum
Appendicular Skeleton
126 Bones
Upper and lower extremities
Pelvic girdle
Pectoral girdle
Skull (cranial bones)
1 frontal (forehead) 2 parietal (top and sides of skull) 2 temporal (temple region) 1 occipital (rear of skull)
Skull (facial bones)
2 nasal 2 maxillae (upper lip) 1 mandible (jaw) 2 zygomatic (cheek bones)
Hyoid Bone
Only bone in body that does not join with any other bone
Purpose is to provide a movable base for the tongue
Ear Bones
2 malleus - hammer
2 incus - anvil
2 stapes - stirrup
Vertebrae
7 cervical (C1-C7) 12 Thoracic (T1-T12) 5 Lumbar (L1-L5) 5 fused sacral bones (sacrum) 4 fused coccygeal bones (coccyx/tailbone)
Sternum
consists of manubrium, body, and xiphoid process
Ribs
24 (12 pairs)
Each pair articulate with one of the 12 thoracic vertebrae
Pectoral Girdle (shoulder girdle)
Scapula and clavicle
Attaches upper extremities to axial skeleton
Pelvic Girdle (hip)
2 hipbones unite anteriorly at the pubic symphysis; and posteriorly at the sacrum
Hipbone formed of ilium, pubis and ischium
Provides strong and stable support for lower extremities
Upper extremities
Humerus (upper arm) Radius (lower lateral arm) Ulna (lower medial arm) Carpals (8 wrist bones) Metacarpals (5 hand bones) Phalanges (14 fingers bones)
Lower extremities
Femur (upper leg bone) Patella (kneecap) Tibia (lower medial leg bone/shin) Fibula (lower lateral leg bone) Tarsals (7 ankle bones) Metetarsals (5 foot bones) Phalanges (14 toe bones)
Fibrous joints
Structural classification Fibrous tissue No joint cavity between bones Suture Joints most common Syndesmoses and gomphoses are 2 other types
Cartilaginous Joints
Structural classification
Bones joined by cartilage
No joint cavity
Synchondroses and symphyses are 2 types