LP 2: muscle attachments Flashcards
sternocleidomastoid o & i
o: manubrium, clavicle
i: mastoid process
sternocleidomastoid action
move vertebral column, move and rotate head
digastric o & i
o: mandible
i: hyoid
digastric action
depress mandible, elevate hyoid during chewing/swallowing
scalenes o & i
o: vertebral column
i: first and second ribs
scalenes action
elevate 1st and 2nd ribs, flex and laterally bend the neck
external intercostals o & i
o: ribs
i: rib immediately below
external intercostals action
elevate ribs during forced respiration
rectus abdominis o & i
o: pubic symphysis, pubic crest
i: xiphoid process, ribs
rectus abdominis action
flex trunk anteriorly
transverse abdominis o & i
o: ilium, ribs
i: linea alba, pubic crest, pubis
transverse abdominis action
compress abdominal viscera during expiration
rotate trunk (ipsilateral)
pectoralis major o & i
o: clavicle, sternum, ribs, rectus sheath
i: humerus
pectoralis major action
adduction, internal rotation, flexion, extension, draw scapula anteroinferiorly
trapezius o & i
o: occipital bone, vertebral column
i: clavicle, acromion, scapula
trapezius action
stabilize and move scapula, extend neck
latissimus dorsi o & i
o: ilium, ribs, vertebral column, scapula
i: humerus
latissimus dorsi action
adduct, medially rotate, extend arm at glenohumeral joint
deltoid o & i
o: clavicle, acromion, scapula
i: humerus
deltoid action
arm abduction
teres major o & i
o: scapula
i: humerus
teres major action
extension and rotation of arm
supraspinatus o & i
o: scapula
i: radius
supraspinatus action
abduct arm and stabilize humerus head
biceps brachii o & i
o: scapula
i: radius
biceps brachii action
flexion and supination of forearm
brachialis o & i
o: humerus
i: ulna
brachialis action
flexion of elbow
triceps brachii o & i
o: humerus, scapula
i: ulna
triceps brachii action
extension of forearm
flexor carpi ulnaris o & i
o: humerus, ulna
i: pisiform, hamate, metacarpal 5
flexor carpi ulnaris action
wrist flexion and adduction
extensor digitorum o & i
o: humerus
i: extensor expansions of digits 2-5
extensor digitorum action
finger extension
sartorius o & i
o: ilium
i: tibia
sartorius action
flexion, external rotation, abduction of leg, flexion of knee, rotation of tibia
gluteus maximum o & i
o: sacrum and coccyx, ilium
i: iliotibial tract, femur
gluteus maximus action
abduction, adduction, external rotation, extension if thigh
rectus femoris o & i
o: femur, ilium
i: patella, tibia
rectus femoris action
leg extension
gracilis o & i
o: pubis
i: tibia
gracilis action
thigh flexion and adduction, leg flexion and internal rotation
biceps femoris o & i
o: pelvis, sacrotuberous ligament, femur
i: fibula
biceps femoris action
flexion and external rotation of leg and thigh, stabilize pelvis
semitendinosus o & i
o: ischial tuberosity
i: fibula
semitendinosus action
leg flexion and internal rotation, thigh extension and internal rotation, stabilize pelvis
tibialis anterior o & i
o: tibia, interosseous membrane
i: medial cuneiform, metatarsal 1
tibialis anterior action
foot dorsiflexion, foot inversion
gastrocnemius o & i
o: femur
i: calcaneous
gastrocnemius action
plantarflexion of foot, leg flexion
