Muscles OIA Flashcards
masseter
O: zygomatic arch
I: mandibular angle and mandibular ramus
A: elevates mandible
Temporalis
O: temporal fossa of the temporal bone
I: coronoid process of the mandible
A: elevates mandible and retracts mandible
Sternocleidomastoid
O: manubrium, medial clavicle
I: mastoid process of the temporal bone
A: flexes and rotates the head
Scalenes: anterior, middle and posterior
O: transverse processes of the cervical vertebrae
I: anterior surface of ribs 1-2
A: elevates ribs 1-2, flexes neck, rotates neck
Pectoralis major
O: sternal end of the clavicle, sternum, ribs 1-6
I: greater tubercle of the humerus
A: flexes arm at shoulder, rotates arm medially, addicts arm
Pectoralis minor
O: ribs 3-5
I: coracoid process of the scapula
A: depresses scapula, rotates scapula downwards
Serratus Anterior
O: ribs 1-8
I: vertebral border of the scapula
A: rotates scapula upwards, protracts scapula
External intercostals
O: Inferior border of ribs
I: superior border of ribs
A: elevates rib cage
Internal intercostals
O: superior border of ribs
I: inferior border of ribs
A: depresses rib cage
External oblique
O: ribs 1-2
I: lines alba, pubic crest, pubic tubercle, iliac crest
A: flexes and rotates vertebral column, compresses abdomen
Internal oblique
O: lumbar fascia, iliac crest, inguinal ligament
I: linea alba, pubic crest, ribs 9-12
A: flexes and rotates vertebral column, compresses abdomen
Rectus abdominis
O: pubic crest, pubic symphysis
I: xiohoid process of the sternum, ribs 5-7
A: flexes and rotates vertebral column, compresses abdomen
Iliacus
O: iliac fossa, ala of the sacrum
I: lesser trochanter of the femur
A: flexes thigh at hip, flexes trunk
Psoas major
O: transverse process of T12-L5
I: lesser trochanter of the femur
A: flexes thigh at hip, flexes trunk laterally
Deltoid
O: lateral 1/3 of clavicle, spine of scapula, acromion process of the scapula
I: deltoid tuberosity of the humerus
A: abducts arm, flexes arm at shoulder, rotates arm medially, extends arm at shoulders, rotates arm laterally
Biceps Brachii long head
O: Supraglenoid tubercle of the scapula
I: radial tuberosity
A: flexes forearm at elbow, supinates forearm
Biceps Brachii short head
O: coracoid process of the scapula
I: radial tuberosity
A: flexes forearm at elbow, supinates forearm
Brachialis
O: anterior humerus
I: coronoid process of the ulna
A: flexes forearm at elbow
Coracobrachialis
O: coracoid process
I: medial surface of shaft of humerus
A: flexes arm at shoulder, addicted arm
Brachioradialis
O: lateral supracondylar ridge of the humerus
I: styloid process of the radius
A: flexes forearm at elbow, stabilizes elbow during flexion and extension
Extensor Capri radialis longus
O: lateral supracondylar ridge of the humerus
I: 2nd metacarpal
A: extends hand at wrist
Extensor Carpi radialis Brevis
O: laters epicondyle of the humerus
I: 3rd metacarpal
A: extends hand at wrist, abducts hand
Extensor digitorum
O: lateral epicondyle of the humerus
I: distal phalanges of 2nd to 5th digit
A: extends distal interphalangeal joints, extends hand at wrist
Extensor carpi ulnaris
O: lateral epicondyle of the humerus, posterior ulna
I: 5th metacarpal
A: extends hand at wrist, adducts hand
Supinator
O: lateral epicondyle of the humerus, proximal ulna
I: proximal end of radius
A: supinates forearm
Abductor pollicis brevis
O: posterior radius, posterior ulna, interosseous membrane
I: trapezium, 1st metacarpal
A: abducts pollex
Extensor pollicis Brevis
O: posterior radius, posterior ulna, interosseous membrane
I: proximal phalanx of pollex
A: extends 1st metacarpal-phalangeal joint
Extensor pollicis longus
O: posterior radius, posterior ulna, interosseous membrane
I: distal phalanx pollex
A: extends 1st interphalangeal joint
Extensor indicis
O: posterior ulna, interosseous membrane
I: distal phalanx of 2nd digit
A: extends 2nd distal interphalangeal joint
Extensor digiti minimi
O: lateral epicondyle of the humerus
I: distal phalanx of 5th digit
A: extends 5th distal interphalangeal joint
