EXS 331 Exam 4: Breathing Muscles & Abdominal Muscles

diaphragm

A: pulls central tendon downward during inspiration

N: phrenic nerve

external intercostals

A: elevates ribs during inspiration

N: intercostal nerves

internal intercostals

A: draws ribs together in forced expiration

N: intercostal nerves

Rectus abdominis

A: flexes vertebral column, support pelvic girdle

N: thoracic nerves T7-T12

linea alba

Line separating right/left rectus abdominis

-band of CT that expands from the xiphoid process to the pubic tubercle, site of attachment for the sheet like structures/muscles (obliques)

Tendinous intersections

three/four transverse bands of collagen fibers that divide the rectus abdominis into segments

Inguinal ligament

V line

-goes from ASIS to pubic symphysis, made of collagen fibers, aponeurosis of inferior part of external oblique (anatomical landmark)

above it=hip

below it=thigh

Inguinal canal

the channel in the abs which the spermatic cord travels through (males) or round ligament of uterus (female)

external oblique

A: compresses abdomen, laterally flexes and rotates vertebral column

N: thoracic nerves T7-T12

Internal oblique

A: compress abdomen, laterally bend and rotate vertebral column

N: T8-T12

Transversus abdominis

A: compresses abdomen and laterally bend trunk

N: T8-T12

-deepest layer, transverse fibers