Origin: long head- supraglenoid tubercle of scapula, short head- coracoid process of the scapula with coracobrachialis.
Insertion: posterior border of bicipital tuberosity of the radius (over bursa) and bicipital aponeurosis to deep fascia and subcutaneous ulna
Action: supinates forearm, flexes elbow, weakly flexes shoulder 2. Pectineus
Origin: Pectineal line of pubis and narrow area of superior pubic ramus below it Insertion: A verticle line between spiral line and gluteal crest below lesser trochanter of femur Action: Flexes, adducts and medially rotates hip 3. Rectus Femoris
Origin: Straight head: anterior inferior iliac spine. Reflected head: ilium above acetabulum
Insertion: Quadriceps tendon to patella , via ligamentum patellae into tubercle of tibia
Action: Extends leg at knee. Flexes thigh at hip 4. Orbicularis Oris
Origin: Near midline on anterior surface of maxilla and mandible and modiolus at angle of mouth
Insertion: Mucous membrane of margin of lips and raphe with buccinator at modiolus
Action: Narrows orifice of mouth, purses lips and puckers lip edges
Origin: Lateral head: posterior surface of lateral condyle of femur and highest of three facets on lateral condyle. medial head: posterior surface of femur above medial condyle
Insertion Plantar flexes foot. Flexes knee: Tendo calcaneus to middle of three facets on posterior aspect of calcaneus
2. Axial Muscles (origin, location, action, innervation)
There are four principle axial muscles of the body they are the muscles of the body. They are the muscles of the head and neck, muscles of the vertebral column, oblique and rectus muscles, and the muscles of the pelvic floor.
The muscle of the head and neck contains muscles that allow movement of the eyes, face, tongue, and larynx. These muscles are facial expression muscles, extrinsic eye muscles, tongue muscles, pharynx muscles, and anterior neck muscles. One of the muscles associated with the head and neck muscle is the temporoparietalis. The temporparietalis origin is the aponeurosis above the auricular. The muscles insertion is the galeal aponeurosis. The action is that it fixes galeal aponeurosis. The nerve associated with the temporparietalis is the temporal branch of the facial nerve (VII). The muscle of the vertebral column contains various flexors, extensors, and rotator. The muscles of the vertebral column include many dorsal extensors, but few ventral flexors. One of the muscles associated with the vertebral muscle is the erector spinae- spinalis. The erector spinae- spinalis origin is the spinous processes, its insertion is spinous processes six levels above, its action is the lateral flexion of the spine. The nerve associated with the elector spinae- spinalis is the posterior primary rami. The oblique and rectus muscles lie within the body wall, between the spinous processes…