anatomy quiz, so help me god

trapezius

large, triangular muscle in upper back. runs horizontally from base of skull to shoulder. fibers organized in 3 groups (upper, middle, lower)

rotate scapula

overall function of trapezius

raising scapula/shoulder (shrugging)

function of upper trapezius

pull scapula toward vertebrae

function of middle trapezius

draw scapula/shoulder downward

function of lower trapezius

pull head backward or to one side

function of trapezius when other muscles fix shoulder in position

rhomboideous major

connects vertebral column to scapula

retract (squeeze back) and elevate scapula, rotate scapula downward

function of rhomboideus major

levator scapulae

straplike muscle, runs vertically through neck, connecting cervical vertebrae to scapulae

elevates scapula

function of levator scapulae

splenius capitis

broad straplike muscle, back of the neck, connects base of skull to cervical vertebrae and upper thorax

rotates head to opposite side, flexes neck

function of one splenius capitis

brings head to upright position

function of two splenius capitis

teres major

connects scapula to humerus

extension of shoulder (move arm back and upward). adduct and rotate arm medially

function of teres major

latissimus dorsi

wide, triangular muscle, curves upward from lower back around the side to the armpit

extend shoulder and adduct arm, rotate humerus medially, pull shoulder down and back. pull arm back in swimming, climbing, and rowing

function of latissimus dorsi

supraspinatus

in the depression above the spine of the scapula on posterior surface, connects scapula to greater tubercle of humerus

abducts the arm (moves it away from the midline)

function of supraspinatus

infraspinatus

in depression below the spine of the scapula on posterior surface. attaches scapula to humerus

rotate arm laterally

function of infraspinatus

deltoid

thick, triangular muscle that covers shoulder joint. connects clavicle and scapula to lateral side of humerus

abducts the arm, posterior fibers extend shoulder and anterior fibers flex shoulder

function of deltoid

pectoralis major

thick, fan shaped muscle in upper chest. fibers run from center of thorax through armpit to humerus

pulls arm forward and across chest, rotate humerus medially and adduct the arm from a raised position, flexion of shoulder (raise arm upward above head)

function of pectoralis major

pectoralis minor

thin flat muscle that lies beneath the pectoralis major. runs laterally and upward from ribs to scapula

pulls scapula forward and downward

function of pectoralis minor

raise ribs and aid in forceful inhalation

function of pectoralis minor when other muscles fix scapula in position

broad, thin sheet of muscle, fibers slant downward from lower ribs to pelvic girdle

external oblique

when contracted, tenses abdominal wall and compresses contents of abdominal cavity. flexes and rotates vertebral column

function of external oblique

internal oblique

broad thin sheet of muscle beneath external oblique. fibers run up and forward from pelvic girdle to lower ribs (basically opposite direction of external oblique)

When contracted, tenses abdominal wall and compresses contents of abdominal cavity, flexes and rotates vertebral column

function of internal oblique (hint: same as external oblique)

rectus abdominis

long, straplike muscles that connect pubis bones to the ribs and sternum

compresses contents of abdominal cavity, flexes vertebral column

function of rectus abdominis

transversus abdominis

forms third layer of muscle beneath external/internal obliques. fibers run horizontally from lower ribs/lumbar vertebrae and ilium to the pubic bones

when contracted, tenses abdominal wall and compresses contents of abdominal cavity. flexes and rotates vertebral column

function of transversus abdominis

serratus anterior

broad curved muscle located on side of chest

protracts and rotates scapula, used to thrust the shoulder forward (like when pushing something)

function of serratus anterior

serratus posterior

on the top of the back and the middle/lumbar region. kind of on the ribs. has a superior and inferior portion

elevate or depress the ribs, aiding in deep inhalation and forced exhalation

function of serratus posterior