Wet Lab Practical 2

PA of 1

Posterior tubercle of C1

DA of 1

Medial aspect of inferior nuchal line

Action of 1

Extends the head

PA of 2

SP of C2

DA of 2

Lateral aspect of inferior nuchal line

Action of 2

Extends head and ipsilateral rotation

PA of 3

TP of C1

DA of 3

Between superior & inferior nuchal lines

Action of 3

Extension and lateral flexion of head

PA of 4

SP of C2

DA of 4

TP of C1

Action of 4

Rotates atlas, turning head ipsilaterally

What is the innervation for these 4 muscles?

PR of C1 (Suboccipital nerve)

PA of this muscle

TP of C3-C6

DA of this muscle

Scalene tubercle of 1st rib

Action of this muscle

Neck flexion and elevates the first rib during forced inspiration

Innervation of this muscle

AR C4 - C6

PA of this muscle

TP of C2 - C7

DA of this muscle

Superior surface of first rib posterior to groove for subclavian artery

Action of this muscle

Lateral neck flexion and elevates first rib during forced inspiraiton

Innervation of this muscle

AR of cervical spinal nerves

PA of this muscle

TP of C5 - C7

DA of this muscle

2nd rib

Action of this muscle

Lateral neck flexion and elevates 2nd rib during forced inspiration

Innervation of this muscle

AR C7 - C8

PA of this muscle

TPs of C1-C4

DA of this muscle

Medial border of the scapular superior to the root of the scapular spine

Action of this muscle

Elevates and downwardly rotates scapula

Innervation of this muscle

Dorsal scapular nerve C5 & C3, C4

PA of this muscle

Inferior border and medial surface of maxillary process of zygomatic bone and the zygomatic arch

DA of this muscle

Angle and lateral surface of ramus of mandible

Action of this muscle

Elevates mandible closing jaws; superficial fibers may make limited contribution to protrusion of mandible

Innervation of this muscle

CN V₃ via masseteric nerve

PA of this muscle

Temporal fossa and temporal fascia

DA of this muscle

Coronoid process and anterior border of ramus of mandible

Action of this muscle

Elevates mandible closing jaws; posterior fibers are primary retractors of the mandible

Innervation of this muscle

CN V₃ via deep temporal branches

SA of the pinned muscles

Inferior border of ribs

IA of the pinned muscles

Superior border of ribs below

Action of the pinned muscles

Approximate the ribs

Innervation of the pinned muscles

AR T1-T12 (intercostal nerves)

PA of this muscle

L1-L3, medial & lateral arcuate ligaments, lower 6 ribs and costal cartilages, xiphoid process

DA of this muscle

Central tendon of diaphragm

Action of this muscle

Flattens central tendon, increasing vertical diameter of thoracic cavity in inspiration

Innervation of this muscle

Phrenic nerve C3, C4, C5

Origin of the muscle with the pink dot

Pubic symphysis and pubic crest

Insertion of the muscle with the pink dot

Xiphoid process and costal cartilages of 5th-7th ribs

Action of the muscle with the pink dot

Flexes trunk (lumbar vertebrae), compresses/supports abdominal viscera, and stabilizes the pelvis

Innervation of the muscle with the pink dot

Thoracoabdominal nerves (AR T6-T12)

Origin of the muscle with the blue dot

External surfaces of 5th-12th ribs

Insertion of the muscle with the blue dot

Linea alba, pubic tubercle, and anterior half of iliac crest

Action of the muscle with the blue dot

Flex trunk, laterally flex trunk to ipsilateral side, rotate trunk to contralateral side (with oppostie internal oblique), & compresses/supports abdominal viscera

Innervation of the muscle with the blue dot

Thoracoabdominal nerves (AR T6-T12)

Origin of the muscle with the pink dot

Thoracolumbar fascia, anterior 2/3 of iliac crest and connective tissue deep to the lateral 1/3 of inguinal ligament

Insertion of the muscle with the pink dot

Inferior borders of 10th-12th ribs, linea alba, and pecten pubis (pectineal line of pubis) via conjoint tendon

Action of the muscle with the pink dot

Flex trunk, laterally flex trunk to ipsilateral side, rotate trunk to ipsilateral side, and compresses/supports abdominal viscera

Innervation of the muscle with the pink dot

Thoracoabdominal nerves (AR T6-T12) and L1

Origin of the muscle with the blue dot

Internal surfaces of 7th-12th costal cartilages, thoracolumbar fascial, iliac crest, and connective tissue deep to lateral 1/3 of inguinal ligament

Insertion of the muscle with the blue dot

Linea alba with the aponeurosis of the internal oblique, pubic crest, and pecten pubis (pectineal line of pubis) via the conjoint tendon

Action of the muscle with the blue dot

Compresses/supports abdominal viscera

Innervation of the muscle with the blue dot

Thoracoabdominal nerves (AR T6-T12) and L1

SA of this muscle

Medial half of inferior border of 12th ribs and lumbar TPs

IA of this muscle

Iliolumbar ligament and internal lip of iliac crest

Action of this muscle

Extends/laterally flexes vertebral column and fixes 12th rib during inspiration

Innervation of this muscle

AR T12-L4

SA of the green muscle

Sides of bodies of T12 and L1 vertebrae

IA of the green muscle

Pectineal line of pubis (pectin pubis) and iliopectineal eminence

Action of the green muscle

Flexes the pelvis and lumbar vertebral column

Innervation of the green muscle

AR L1

PA of muscle with blue dot

Anterior surface of sacrum and sacrotuberous ligament

DA of muscle with blue dot

Superior border of greater trochanter of femur

Action of muscle with blue dot

ER hip and stabilizes femoral head in acetabulum

Innervation of muscle with blue dot

Branches of AR (S1)

What is the action of this group of muscles?

ER extended hip, abducts flexed hip, and stabilizes femoral head in acetabulum

What is the action of this muscle?

ER hip and stabilizes femoral head in acetabulum