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Lecture 14

Lecture 14- Upper Limb.doc

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Queen's University
Anatomy and Cell Biology
ANAT 215
Leslie W Mac Kenzie

ANATOMY 215 UPPER LIMB (Reading Materials: Chapter 7: pages 182-191; Chapter 8: pages 223-228) • Bones: (32 bones – 64 bones in total) • pectoral girdle: connects axial skeleton to upper limb • formed by the clavicle and scapula and connect the upper limbto the axial skeleton • clavicle (collar bone): articulates with manubrium of sternum • easilybroken/fractured, usuallymidshaft • double curvature- convex on medial side, concave on posterior side (anterior view) • sternal end-medial end-articulate with manubrium (larger facet) • sternoclavicular joint- reinfstced by ligaments (between clavicles, between clavicles and sternum, between clavicle and 1 rib) • acromial end • scapulae (shoulder blade): • triangular in shape • borders: • superior- hook-like process at lateral end • medial (vertebral)- thin, sharp • lateral (axillary)- thicker, stronger • angles (corners of scapulae): • superior- between superior and medial borders • inferior- between medial and lateral borders • lateral- between superior and lateral borders • anterior (costal) surface: • subscapular fossa- anterior side • coracoid process- on superior border • posterior surface: • spine: • acromion (projection)- articulates with acromial/lateral end of clavicle • acromioclavicular joint- reinforced by ligaments, connecting acromion with end of clavicle and clavicle with coracoid process • supraspinous fossa- superior to spine, origin of rotator cuff muscles • infraspinous fossa- inferior to spine • glenoid fossa (cavity)- arm articulates, expanded by fibrocartilagenous ring • arm: • humerus: • head-articulates with glenoid fossa (medially, superiorly) • anatomical neck- distal to head • surgical neck- distal to anatomical neck, weakest part (easilybroken) • shaft (body)- diaphysis • Proximal end: • greater tubercle (lateral)- 3 facets: superior, middle, inferior • lesser tubercle (medial and anterior)- attachment/insertion for rotator cuff muscles • intertubercular (bicipital) groove- continues down to shaft Mid-shaft: • deltoid tuberosity (on the lateral border)- insertion for muscle • Distal end: • medial (palpable on medial side of elbow, nerves run under-“funnybone”) and lateral
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