#6 - Abdominal Wall Muscles (video)

0.0(0)

Studied by 4 people

Call Kai

Learn

Practice Test

Spaced Repetition

Match

Flashcards

Knowt Play

Card Sorting

1/23

Earn XP

Description and Tags

Musculoskeletal Unit 1 - Exam 1

Last updated 2:54 AM on 8/27/26

Name	Mastery	Learn	Test	Matching	Spaced	Call with Kai	Chat

No analytics yet

Send a link to your students to track their progress

24 Terms

New cards

Two Parts of the Abdomen that are directly in contact with Back muscles

1) POSTERIOR ABDOMINAL WALL

2) ANTEROLATERAL ABDOMINAL WALL

New cards

Posterior Abdominal Wall Muscles (4)

Quadratus lumborum

Iliacus

Psoas major

Psoas minor* (Don’t Go in Detail)

<p><span style="color: rgb(31, 235, 240);"><strong>Quadratus lumborum</strong></span></p><p><span style="color: rgb(233, 210, 255);"><strong>Iliacus </strong></span></p><p><span style="color: rgb(250, 145, 145);"><strong>Psoas major </strong></span></p><p><span style="color: rgb(129, 250, 107);"><strong>Psoas minor*</strong></span> (Don’t Go in Detail)</p>

New cards

Quadratus lumborum (5)

Origin: Pelvis & Iliolumbar l.

Insertion: 12th rib & lumbar vertebrae

Innervation: Subcostal n. (T12 ventral ramus) & L1-L4 ventral rami

Action:

Bilateral – stabilizes the 12th rib; bearing down & expiration
Unilateral – ipsilateral lateral flexion of trunk

<p>Origin: <span style="color: rgb(255, 25, 226);">Pelvis & Iliolumbar l.</span></p><p>Insertion: <span style="color: rgb(49, 244, 102);">12th rib & lumbar vertebrae</span></p><p><span style="color: rgb(49, 244, 102);">.</span></p><p>Innervation: S<span style="color: rgb(193, 151, 246);"><strong>ubcostal n. (T12 ventral ramus)</strong></span> & <span style="color: rgb(34, 255, 13);">L1-L4 ventral rami</span></p><p>Action:</p><ul><li><p>Bilateral –<span style="color: yellow;"><strong> stabilizes the 12th rib; bearing down & expiration</strong></span></p></li><li><p>Unilateral <span style="color: rgb(255, 158, 85);"><strong>– ipsilateral lateral flexion</strong></span> of trunk</p></li></ul><p></p>

New cards

Iliacus

Ilium of pelvis

Innervation: Femoral n. (L2-L4) (Ventral rami )

New cards

Psoas major

Origin: Lumbar vertebrae

Innervation: Ventral rami (L1- L3)

<p>Origin:<span style="color: yellow;"><strong> Lumbar vertebrae</strong></span></p><p>Innervation: <span style="color: rgb(246, 156, 10);"><strong>Ventral rami (L1- L3)</strong></span></p>

New cards

Iliopsoas

Distally, Iliacus & Psoas major mm. unite to form the iliopsoas m.

Insertion: Femur

Actions: Flexes hip joint Stabilize trunk/spine, hip

<p>Distally, <span style="color: rgb(233, 210, 255);"><strong>Iliacus </strong></span>& <span style="color: rgb(250, 145, 145);"><strong>Psoas major</strong></span> mm. unite to form the <span style="color: rgb(255, 154, 30);"><strong>iliopsoas </strong></span>m.</p><p><span style="color: yellow;"><strong>Insertion: Femur</strong></span></p><p>Actions: Flexes hip joint <span style="color: rgb(74, 255, 72);"><strong>Stabilize trunk/spine, hip</strong></span></p>

New cards

In a transverse plane view where are the Psoas major & Quadratus lumborum in relation to each other

New cards

Thoracolumbar fascia Location

Connection between back muscles, posterior abdominal wall muscles, and anterolateral abdominal wall muscles

New cards

Thoracolumbar Fascia Laterally Connects to which muscles

2) Internal oblique

3) Transverse Abdominals

New cards

Layer Muscles of the ANTEROLATERAL Abdominal Wall Muscle (3)

1) External oblique

2) Internal oblique

3) Transverse Abdominals

New cards

Abdominal Wall Muscles Function

Lateral flexors and rotators of the trunk

Supports trunk and vertebral column protects abdominal viscera

Produce force required for:

Defecation
Micturition
Vomiting
Parturition (Baby pushing)

New cards

ANTEROLATERAL Abdominal Wall Muscles Diagram

New cards

Anterolateral Wall Muscle (Exception)

Rectus abdominis m

Ones abs and there 12th rib

<p><span style="color: rgb(255, 35, 254);">Rectus abdominis</span> m</p><ul><li><p>Ones abs and there 12th rib</p></li></ul><p></p>

New cards

Rectus Abdominis m

Origin: Pubic bone of pelvis

Insertion: Sternum and Ribs Innervation

Innervation: Intercostal nn. (ventral rami) & subcostal n. (T12 ventral ramus)

Actions: Flex trunk, compress abdominal viscera, stabilize pelvis

<p>Origin: Pubic bone of pelvis</p><p>.</p><p>Insertion: Sternum and Ribs Innervation</p><p>.</p><p>Innervation: <span style="color: rgb(128, 216, 255);"><strong>Intercostal nn. (ventral rami)</strong></span> & <span style="color: rgb(85, 247, 45);"><strong>subcostal n. (T12 ventral ramus)</strong></span></p><p>,</p><p>Actions: <span style="color: rgb(244, 88, 88);"><strong>Flex trunk</strong></span>, compress abdominal viscera, <span style="color: rgb(240, 56, 255);">stabilize pelvis</span></p>

New cards

External Oblique m.

Origin: Ribs

Insertion: Linea alba, pubic and ilium of pelvis

Innervation: Intercostal nn. (ventral rami) & subcostal n. (T12 ventral ramus)

Actions:

Bilateral: flex trunk, compress and support abdominal viscera & stabilize pelvis
Unilateral: ipsilateral lateral flexion & contralateral rotation of trunk

<p>Origin: Ribs</p><p>Insertion: <span style="color: rgb(247, 175, 7);">Linea alba</span>, <span style="color: yellow;"><strong>pubic and ilium of pelvis</strong></span> </p><ul><li><p>Innervation: Intercostal nn. (ventral rami) & subcostal n. (T12 ventral ramus)</p></li></ul><p>.</p><p>Actions:</p><ul><li><p>Bilateral: flex trunk, compress and support abdominal viscera & stabilize pelvis</p></li><li><p>Unilateral: i<span style="color: rgb(13, 233, 249);"><strong>psilateral lateral flexion </strong></span>& <span style="color: yellow;"><strong>contralateral rotation of trunk</strong></span></p></li></ul><p></p>

New cards

Internal Oblique m.

Origin: Thoracolumbar fascia, ilium of pelvis

Insertion: Ribs & linea alba

Innervation: Intercostal nn. (ventral rami), subcostal n. (T12 ventral ramus), ilioinguinal n. (L1 ventral ramus), iliohypogastric n. (L1 ventral ramus)

Actions:

Bilateral: flex trunk, compress and support abdominal viscera, stabilize pelvis
Unilateral: ipsilateral lateral flexion & ipsilateral rotation of trunk

<p>Origin: Thoracolumbar fascia, ilium of pelvis</p><p>Insertion: Ribs & linea alba</p><p>.</p><p>Innervation: <span style="color: yellow;"><strong>Intercostal nn.</strong></span> (ventral rami), <span style="color: rgb(160, 228, 255);"><strong>subcostal n. (T12 ventral ramus)</strong></span>, <span style="color: rgb(234, 123, 255);"><strong>ilioinguinal n.</strong></span> (L1 ventral ramus), <span style="color: rgb(250, 115, 33);"><strong>iliohypogastric n. </strong></span>(L1 ventral ramus)</p><p>.</p><p>Actions:</p><ul><li><p>Bilateral: flex trunk, compress and support abdominal viscera, stabilize pelvis</p></li><li><p>Unilateral: ipsilateral lateral flexion & <span style="color: rgb(255, 33, 33);"><strong>ipsilateral </strong></span>rotation of trunk</p></li></ul><p></p>

New cards

Transversus Abdominis m.

Origin: Ribs, thoracolumbar fascia, ilium of pelvis

Insertion: Linea alba & pubic of pelvis

Innervation: Intercostal nn. (ventral rami), subcostal n. (T12 ventral ramus), ilioinguinal n. (L1 ventral ramus), iliohypogastric n. (L1 ventral ramus)

Actions: