Muscles of the trunk and upper limbs

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created 9 years ago by rappt2
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1

pectoralis major

large, fan-shaped muscle covering superior portion of chest
O - sternal end of clavicle, sternum, cartilage of ribs 1-6, and aponeurosis of external oblique muscle
I - fibers converge to insert by a short tendon into intertubercular of sulcus and greater tubercle of humberus

2

serratus anterior

fan-shaped muscle, deep to scapula, deep and inferior to pectoral muscles on lateral rib cage
O - by a series of muscle slips from ribs 1-8
I - entire anterior surface of vertebral border of scapula

3

external intercostals

11 pairs lie between ribs; fibers run obliquely (down and forward) from each rib to rib below

4

internal intercostals

11 pairs 11 between ribs; fibers run deep to and at right angles to those of external intercostals (run downward and posteriorly)

5

diaphragm

broad muscle pierced by the aorta, inferior vena cava, and esophagus, forms floor of thoracic cavity

6

rectus abdominus -

medial superficial muscle pair; extend from pubis to rib cage; ensheathed by aponeuroses of lateral muscles; segmented by three tendinous intersections
O - pubic crest and symphysis
I - xiphoid process and costal cartilages of ribs 5-7

7

external oblique

largest and most superficial of the three lateral muscles; aponeurosis of the external oblique is medial

8

internal oblique

inferior to external oblique, superior to transverse abdominis, most fibers run upwards and medially

9

transverse abdominis

deepest muscle of abdominal wall; fibers run horizontally

10

trapezius

most superficial muscle of posterior thorax; flat, and triangular in shape

11

latissimus dorsi -

broad, flat, triangular muscle of lower back; extensive superficial origins; covered by trapezius superiorly
O - indirect attachment via lumbodorsal fascia into spines of lower six thoracic vertebrae, lumbar vertebrae, lower 3 to 4 ribs, and iliac crest
I - spirals around teres major to insert in floor of intertubercular sulcus of humerus

12

splenius capitis

broad bipartite superficial muscle extending from upper thoracic vertebrae to skull; capitis portion = "bandage muscle" because it covers and holds down deeper neck muscles

13

supraspinatus

named for its location on posterior aspect of scapula; deep to trapezius; a rotator cuff muscle

14

infraspinatus

partially covered by deltoid and trapezius; named for its scapular location; a rotator cuff muscle

15

subscapularis

forms part of posterior wall of axilla; tendon of insertion passes in front of shoulder joint; a rotator cuff muscle

16

teres major

thick, rounded muscle; located inferior to teres minor; helps to form posterior wall of axilla (along with latissimus dorsi and subscapularis)

17

rhomboids

two roughly diamond shaped muscles lying deep to trapezius and inferior to levator scapulae; rhomboid minor is the more superior

18

levator scapulae

located at back and side of neck, deep to trapezius; thick, straplike muscle

19

brachialis

strong muscle that is immediately deep to biceps brachii on distal humerus

20

triceps brachii

large fleshy muscle; the only muscle of posterior compartment of arm; three-headed origin; long and lateral heads lie superficial to medial head
O - long head: infraglenoid tubercle of scapula; lateral head: posterior shaft of humerus; medial head: posterior humeral shaft distal to radial groove
I - by common tendon into olecranon process of ulna

21

brachioradialis

superficial muscle of lateral forearm; forms lateral boundary of cubital fossa; extends from distal humerus to distal forearm

22

flexor carpi radialis -

runs diagonally across forearm; midway its fleshy belly is replaced by a flat tendon that becomes cordlike at wrist
O - medial epicondyle of humerus
I - base of second and third metacarpals; insertion tendon easily seen and provides guide to position of radial artery (pulse taking) at wrist

23

flexor carpi ulnaris

most medial muscle of this group; two-headed; ulnar nerve lies lateral to its tendon

24

flexor digitorum superficialis

two-headed muscle; more deeply placed, forms intermediate layer; overlain by muscle above but visible at distal end of forearm

25

extensor carpi ulnaris

most medial of superficial posterior muscles; long, slender muscle
O - lateral epicondyle of humerus and posterior border of ulna
I - base of fifth metacarpal

26

extensor digitorum

lies medial to extensor carpi radialis brevis; a detached portion of this muscle, called extensor digiti minimi, extends little finger

27

extensor carpi radialis

somewhat shorter than extensor carpi radialis longus and lies deep to itqq

28

flexor pollicis longus

partly covered by flexor digitorum superficials; parallels flexor digitorum profundus laterally

29

extensor pollicis longus and brevis

deep muscle pair with a common origin and action; overlain by extensor carpi ulnaris