Muscles A&P Flashcards
Biceps Brachii-Origin
long head: tubercle above glenoid cavity
short head: tip of coracoid process of scapula
Biceps Brachii-Insertion
common tendon to radial tuberosity
Biceps Brachii-Action
flexes elbow joint, supinates forearm, weak flexor at shoulder
Biceps Femoris-Origin
long head-Ischial tuberosity
short head- linea aspera and distal femur
Biceps Femoris-Insertion
common tendon into head of fibula, lateral condyl of tibia
Biceps Femoris- Action
flexes the leg at knee, extends thigh, laterally rotates the knee is flexed
Brachialis-Origin
frontal distal humerus
Brachialis-Insertion
coronoid process of ulna
Brachialis-Action
flexes forearm at elbow
Brachioradialis-Origin
later supercondylar ridge of humerus
Brachioradialis-Insertion
base of styloid process of radius
Brachioradialis-Action
strong forearm flexor(when forearm is partially flexed)
stabilizes elbow when rapid flexion-extension
Deltoid-Origin
lateral 3rd of clavicle, acromion, spine of scapula
Deltoid-Insertion
deltoid tuberosity of the humerus
Deltoid-Action
flexes and medially rotates humerus with anterior fibers
extends and laterally rotates arm with posterior fibers
extensor radialis brevis-origin
common extensor tendon on anterior surface of the lateral epicondyle of the humerus
extensor radialis brevis-insertion
dorsal surface of base of metacarpal 3
extensor radialis brevis-action
assists in abduction of the wrist
extends something?
extensor radialis longus-origin
distal 1/3 lateral supracondylar ridge of humerus
extensor radialis longus-insertion
dorsal surface of base of metacarpal 2
extensor radialis longus-action
extends wrist w/ extensor carpi ulnaris
abducts write with flexor carpi radials
extensor radialis ulnaris-origin
lateral epicondyle of humerus
extensor radialis ulnaris-insertion
base of the 5th metacarpal
extensor radialis ulnaris- action
extends and abducts wrist
extensor digitorum-origin
common extensor tendon anterior surface of lateral epicondyl of humerus
extensor digitorum-insertion
extensory expansions of digits 2-5
extensor digitorum-action
finger extension, extends wrist, abduct fingers
extensor hallucis longus-origin
middle of anterior surface of fibular, interosseous membrane
extensor hallucis longus-insertion
distal phalanx of big toe digit 1
extensory hallucis longus-action
extends big toe, dorsiflexes foot
external intercostals-origin
inferior border of rib above
external intercostals-insertion
superior border of rib below
external intercostals-action
elevates rib cage, helps in inspiration
external obliques-origin
outer surface of lower 8 ribs
external obliques-insertion
linea aspera vis aponeurosis
external obliques-action
support and compress abdomen, flex vertebral clump anterior ally, laterally flexes, rotates, forces expiration
flexor carpi radiali-origin
medial epicondyle of humerus
flexor carpi radiali-insertion
base of 2nd and 3rd metacarpals
flexor carpi radiali-action
powerful flexor of wrist, abducts hand
flexor carpi ulnaris-origin
medial epicondyle of humerus, olecranon process, posterior surface of ulna
flexor carpi ulnaris-insertion
pisiform and hamate bones, base of 5th metacarpal(anterior)
flexor carpi ulnaris-action
powerful flexor of wrist, adducts hands w/extensor carpi ulnaris, stabilizes wrist during finger extension
flexor digitorm superficialis-origin
medial epicondyle of humerus, coronoid process of ulna. shaft of radius
flexor digitorum superficialis-insertion
by 4 tendons into middle phalanges of fingers 2-5
flexor digitorum superificialis-action
flexes wrist and middle phalanges of fingers 2-5
flexor hallucis longus-origin
midshaft of fibula, interosseous membrane
flexor hallucis longus- insertion
tendons runs underfoot to distal phalanx of big toe-digit 1
flexor hallucis longus-action
flexes big toe, plantar flexes, inverts foot
gastrocnemius-origin
by two heads from medial and lateral condyles of femur
gastrocnemius-insertion
posterios calcanues via calcaneal tendon
gastrocnemius- action
plantar flexes foot when knee is extended, flexes knee when foot is dorsiflexed
gluteus maximus-origin
dorsal ilium, sacrum, coccyx
gluteus maximus-insertion
gluteal tuberosity of femur, iliotibial tract
gluteus maximus-action
extensor of thigh, laterally rotates and abducts thigh, inactive during standing
gluteus medius-origin
lateral surface of ilium between anterior and posterior gluteal lines
gluteus medius-insertion
via short tendon into lateral aspect of greater trochanter
gluteus medius-action
abducts thigh, anterior part rotates hip medially, posterior part rotates hip laterally
infraspinatus-origin
infraspinous fossa of scapular
infraspinatus-insertions
greater tubercle of humerus, posterior to supraspinatus
infraspinatus-action
holds head of humerus in glenoid cavity, stabilizes shoulder joint, rotates humerus laterally
internal intercostals-origin
superior border of rib below
internal intercostals-insertion
inferior border of rib above(costal groove)