lab 5 aoi

parallel muscle

muscle fascicles are parallel to longitudinal axis of muscle and terminate in flat tendons on both sides

ex: sternohyoid

fusiform muscle

muscle fascicles are nearly parallel to longitudinal axis of the muscle; the belly is narrowed toward the tendons

ex: biceps brachii

circular muscle

muscle fascicles are arranged in concentric form

ex: orbicularis oris

triangular muscle

muscle fascicles spread in a triangular appearance

ex: trapezius

unipennate

muscle fascicles are arranged on only one side of tendon

ex: extensor digitorum longus

bipennate

muscle fascicles are arranged on both sides of a centrally positioned tendon

ex: rectus femoris

multipennate

muscle fascicles are attached obliquely to tendons from many directions

ex: deltoid

Pronator teres

Pronator teres action

pronation of forearm

Pronator teres origin

Humerus (medial epicondyle); Ulnar (coronoid process)

Pronator teres insertion

Radius (lateral mid-shaft)

Pectoralis Major

be able to identify

Pectoralis Major action

Adduction of arm; medial rotation of arm; flexion of arm; tension of arm (from flexed position)

Pectoralis Major origin

Clavicle (medial part); sternum, costal cartilages 1-6,

and aponeurosis of external
abdominal oblique muscle

Pectoralis Major insertion

Humerus (intertubercular
sulcus)

Latissimus Dorsi

be able to identify

Latissimus Dorsi action

Adduction of arm;
extension of arm;
medial rotation of arm

Latissimus Dorsi origin

Sacral and lumbar spines; iliac
crest;
thoracolumbar fascia;
ribs 9-12;
spinous process of T6-12
vertebrae;
scapula (inferior angle)

Latissimus Dorsi insertion

Humerus (intertubercular
sulcus)

deltoid

be able to identify

deltoid action

Flexion and medial rotation of

arm;
abduction of arm;
extension and lateral rotation of
arm

deltoid origin

Clavicle (lateral 1/3);
scapula (acromion & spine)

deltoid insertion

Humerus (deltoid tuber-
osity)

trapezius

be able to identify

trapezius action

Elevation, adduction, depression
& superior rotation of scapula

trapezius origin

Occipital bone (superior nuchal line);

spinous processes of C7 & T1- 12 vertebrae

trapezius insertion

Clavicle (lateral);

scapula (spine and acromion)

pectoralis minor

pectoralis minor action

Stabilizes, abducts & laterally
rotates scapula

pectoralis minor origin

Ribs 3-5

pectoralis minor insertion

Scapula (coracoid pro-
cess)

external oblique

be able to identify

external oblique action

Rotation and flexion of trunk;
compression of abdominal wall
& viscera

external oblique origin

Ribs and costal cartilages 5-12

external oblique insertion

Linea alba;
iliac crest

internal oblique

internal oblique action

Rotation and flexion of trunk;
compression of abdominal wall
& viscera

internal oblique origin

Inguinal ligament;
iliac crest;
thoracolumbar fascia

internal oblique insertion

Linea alba;
costal cartilages 7-10

transverse abdominis

transverse abdominis action

Compression of abdominal wall
& viscera

transverse abdominis origin

Iliac crest;
inguinal ligament;
thoracolumbar fascia; costal
cartilages 7-12

transverse abdominis insertion

Pubis;
linea alba;
xiphoid process of
sternum

brachioradialis

be able to identify

brachioradialis action

Flexion of forearm;
pronation of forearm (when
supinated);
supination of forearm (when
pronated)

brachioradialis origin

Humerus (lateral distal shaft)

brachioradialis insertion

Radius (styloid process)

flexor carpi radialis

Flexion of wrist;
abduction of hand

flexor carpi radialis action

Flexion of wrist; abduction of hand

flexor carpi radialis origin

Humerus (medial epicondyle)

flexor carpi radialis insertion

Metacarpals II and III

(base)

palmaris longus

palmaris longus action

Flexion of wrist (weak); tense
palmar aponeurosis

palmaris longus origin

Humerus (medial epicondyle)

palmaris longus insertion

Palmar aponeurosis

flexor carpi ulnaris

be able to identify

flexor carpi ulnaris action

Flexion of wrist;
adduction of hand

flexor carpi ulnaris origin

Humerus (medial epicondyle);
ulna (olecranon and posterior
border of ulna)

flexor carpi ulnaris insertion

Pisiform and hamate
carpal bones;
metacarpal V (base)

extensor carpi radialis longus

extensor carpi radialis longus action

Extension of wrist;
abduction of hand

extensor carpi radialis longus origin

Humerus (lateral supracondy-
lar ridge)

extensor carpi radialis longus insertion

Metacarpal II (base)

extensor carpi radialis brevis

\

\n extensor carpi radialis brevis action

Extension of wrist;
abduction of hand

\n extensor carpi radialis brevis origin

Humerus (lateral epicondyle)

\n extensor carpi radialis brevis insertion

Metacarpal III (base)

extensor digitorum

extensor digitorum action

Extension of fingers 2-5; exten-
sion of wrist

extensor digitorum origin

Humerus (lateral epicondyle)

extensor digitorum insertion

Middle and distal phalan-
ges of fingers 2-5

extensor carpi ulnaris

extensor carpi ulnaris action

Extension of wrist;
adduction of hand

extensor carpi ulnaris origin

Humerus (lateral epicondyle);
ulna (posterior shaft)

extensor carpi ulnaris insertion

Metacarpal V (base)

flexor pollicis longus

flexor pollicis longus action

Flexion of thumb

flexor pollicis longus origin

Radius (anterior mid-shaft);
Interosseous membrane; Ulna
(coronoid process)

flexor pollicis longus insertion

Distal phalanx of thumb

flexor digitorum profundus

\

flexor digitorum profundus action

Flexion of fingers 2-5; flexion of
wrist and metacarpophalangeal
joints

flexor digitorum profundus origin

Ulna (proximal anterior shaft);
Interosseous membrane

flexor digitorum profundus insertion

Distal phalanges of
fingers 2-5

abductor pollicis longus

\

abductor pollicis longus action

Abduction & Extension of thumb

abductor pollicis longus origin

Radius & Ulna (both proxi-
mal posterior); interosseous

membrane

abductor pollicis longus insertion

Metacarpal I (base)

extensor pollicis longus

extensor pollicis longus action

Extension of thumb

extensor pollicis longus origin

Ulna (posterior mid-shaft);
interosseous membrane

extensor pollicis longus insertion

Distal phalanx of thumb

supinator

supinator action

Supination of forearm

supinator origin

Ulna (posterior proximal

shaft);
lateral epicondyle of humerus

supinator insertion

Radius (lateral proximal
shaft)

abductor pollicis brevis

abductor pollicis brevis action

Abduction of thumb

abductor pollicis brevis origin

Scaphoid, trapezium;
flexor retinaculum

abductor pollicis brevis insertion

Proximal phalanx of
thumb (lateral side)

flexor pollicis brevis

\