origin: iliolumbar ligament, posterior part of the iliac crest; insertion: inferior border of the first rib and transverse process of the upper 4 lumbar vertebrae; action: pure lateral flexion of lumbar vertebral column; helps action of the diaphram in inspiration; nerve supply: Lumbar Plexus, T12, L1, L2, L3
– arises from T12, L1, L2, L3, {L4}
– See: Plantar Muscles of the Foot Origin: 2 heads, the medial surface and the lateral border of the inferior surfaces of the calcaneus; Insertion: fuses with the tendon of the flexor digitorum longus; Action: flexes the 2nd to 5th toes; Nerve Supply: Lateral plantar, S1, S2; (See … Read more
– Anatomy: – origin: anterior surface of transverse process, lateral border of vertebral bodies and corresponding intervertebral discs of T12-L5; – at the 3 o’clock position, the iliopsoas is composed of 45% tendon and 55% muscle; – tendon is located directly anterior to the anterior superior capsulolabral complex at the 2-3 … Read more
– Discussion: – function of the PTFJ – accept 1/6 the axial load of the leg – resist torsional stresses originating from the ankle – resist tensile forces created with weight bearing – resists lateral bending forces – subluxation is common in preadolescent … Read more
– See: Proximal Humeral Physeal Injuries – Discussion: – classification of proximal humeral fractures: – anatomic neck fracture: – one part fracture – two part fractures … Read more
– Discussion: – see: compression of the median nerve at the elbow and forearm; – compression of median nerve where it passes between the two heads of the pronator teres; – Differential Dx: – lacertus fibrosus: – draws tightly across the median nerve when the … Read more
– Anatomy: (see forearm flexors) – origin: – humeral head: medial epicondyle of humerus & common flexion tendon; – ulnar head: medial side of coronoid process of ulna; – insertion: middle 1/3 of lateral surface of … Read more
origin: distal 1/4 of the volar (ant) surface of the ulna; insertion: distal 1/4 of the volar surface of the radius; action: pronates the forearm; nerve supply: Median , C7 , C8 , T1 ; synergists: Pronator Teres Stabilization of the distal ulna by transfer of the pronator quadratus origin.
– Discussion: – first major branch of the brachial artery is the profunda brachii; – arises from the brachial artery high in the arm, about level w/ lower edge of the latissimus dorsi tendon (18-25 cm above the medial epicondyle); – leaves brachial artery to pass posteriorly company w/ … Read more