ANAT 1615 Lower Extremity Summary

ANAT 1615 Lower Extremity Summary - Musculoskeletal Anatomy...

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Musculoskeletal Anatomy – Lower Extremity Hints WARNING : This information is the exceptions only – just the special stuff from the lower extremity chaper of COA. This is by no means all of the info you need to know for the test. If you’re in a bind for time, focus on this pack of notes, muscles actions (especially which muscles work synergistically), cutaneous innervations, specifics about the joints in the lower extremity, and blue boxes. Key: Ant Anterior Post posterior Lat Lateral Med Medial V (vv) Vein(s) A (aa) Artery(ies) Lig Ligament M (mm) Muscle(s) N (nn) Nerve(s) Innerv Innervated Add Adductor Abd Abductor Ext External Int Internal Fx Function Ax Action Rot Rotator(tion) Att Attach Tube tuberosity Jt(s) Joint(s) bc because Comp Compartment w/ With Cuta Cutaneous Comp(s) Compartment(s) Jt Joint Gluteal Region Sacrotuberous and Sacrospinous Ligs – convert sciatic notches in hip bones into greater and lesser sciatic foramina o Greater Sciatic Foramen – passageway for structure entering or leaving pelvis (eg – sciatic n ) o Lesser Sciatic Foramen – passageway for structures entering or leaving perineum (eg – pudendal n ) Gluteus max o largest, heaviest, most coarsely fibered m of body o supplied by both inf (exits pelvis thru greater sciatic foramen, inf to Piriformis m) and sup gluteal aa o strongest extensor of hip o lat rotates thigh o both supplied by sup gluteal a and n o both of these med rotate thigh o **Contralateral leg lift will cause ipsilateral gluteus med and min support to contract to disallow non-weight bearing hip to sink down - keep PSIS’s even. Weak glutes on the side where leg is bearing weight means that the other hip (non-weight bearing side) will sink down. Fig 5.26 Tensor of fascia lata o same n and a as gluteus med/min o Primarily flexes thigh bc of and location o Generally doesn’t act independently Piriformis o leaves pelvis thru greater sciatic foramen o sup gluteal a, v, n emerge SUP to it o inf gluteal a, v, n emerge INF to it o 12% of people have piriformis syndrome – m pierced by a branch of sciatic n. can cause pain down leg. obturator internus and sup & inf gemelli mm o sup gemellus shares same nerve supply as obturator internus: N to obturator int o Inf gemellus shares same n supply as quadratus femoris: n to quadratus femoris o form a tricipital (3-headed) muscle – triceps coxae o incapable of independent ax o obt int leaves pelvis thru lesser sciatic foramen Quadratus femoris – strong lat rot of thigh Greater Sciatic foramen o Passageway for structures entering or leaving pelvis o Piriformis o Int pudendal a (exits) o Sciatic n
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Lesser sciatic foramen o Passageway for structures entering or leaving the perineum o Obt int o Int pudendal a (enters) o Pudendal n (enters) Greater trochanter attachments o Obt int o Piriformis o Gluteus med and min ** Inferior Clunial n comes entirely from ventral rami of sacral plexus (S2-3). ** P.G.O.G.O.Q.
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This note was uploaded on 11/21/2011 for the course ANAT 1615 taught by Professor Samueldemons during the Fall '10 term at Life Chiropractic College West.

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ANAT 1615 Lower Extremity Summary - Musculoskeletal Anatomy...

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