BIOL 240 Lecture Notes - Lecture 16: Quadriceps Femoris Muscle, Hamstring, Gastrocnemius Muscle
Document Summary
Dense fibrous connective tissue divides muscles of the limbs into anatomical compartments. Each compartment innervated by a single named nerve. Muscles with similar developmental origin and function. One of weakest, but most moveable joints. Nine muscles acting on the humerus: deltoid, rotator cuff: sits mm, teres major, lateral dorsii, pectoralis major, coracobrachialis. Prime movers of shoulder joint: deltoid, pectoralis major, latissimus dorsii. Rotator cuff: maintain head of humerus centered within the cavity. Ligaments: coracoacromial, protection, coracohumeral, dorsal, glenohumeral, anterior, transverse humeral, covers tendon of the l. h biceps. Two articulations: hinge joint, femur-tibia, gliding joint, patella-femur, flexion/extension, some rotation. Function: match articular surfaces, shock absorbing, joint stability. Extracapsular, outside the joint cavity: patella, medial collateral, lateral collateral. Intracapsular: anterior cruciate, weaker, prevents hyperextension, prevents anterior displacement, posterior cruciate, stronger, prevents hyperflexion, prevents posterior displacement. Flexors: hamstring group, gastrocnemius, basically forms the calf in our leg.
