Misc Muscles Flashcards
Psoas Major
O:transverse processes of L1-L5, vertebral bodies/intervertebral discs of T12-L5
I:lesser trochanter of femur
N: L2-L4
A: origin fixed> hip flexion
insertion fixed> trunk flexion, lateral bending to same side
Iliacus
O:superior 2/3 of iliac fossa, inner lip of iliac crest, anterior sacroiliac ligament and iliolumbar ligament, lateral aspect of sacrum
I: lesser trochanter and shaft of femur
N: L2-L3
A: hip flexion
Quadratus Lumborum
O:inner lip of iliac crest, iliolumbar ligament
I: 12th rib, transverse process of L1-L4
N: T12-L3
A: extension of lumbar spine, fixes diaphragm during inspiration, lateral bending of lumbar spine, fixation/depression of 12th rib
Psoas Minor
O:T12-L1, vertebral bodies and interverebral discs
I: pectin pubis, ilium
N:L1
A: weak trunk flexion, assists psoas major
External Oblique
O:ribs 5-12
I: aponeurosis that extends to the linea alba, anterior 1/2 of iliac crest, pubic tubercle
N:T7-T12 spinal nerves
A: trunk flexion, posterior pelvic tilt, trunk rotation to opp side, lateral trunk flexion same side, * accessory muscle of forced expiration
Iliopsoas
- combined psoas major and iliacus
* main hip flexors
Internal Oblique
O:thorcolumbar fascia, anterior 2/3 iliac crest, lateral 2/3 of upper portion of inguinal ligament
I: ribs 9-12, cartilage of ribs 7-9, aponeurosis that extends to the linea alba, pubic crest, pectin pubis via conjoint tendon
N: T7-T12, L1
A: trunk flexion, rotation of trunk to same side, bending of trunk to same side,* accessory muscle of forced expiration
Rectus Abdominis
O:pubic tubercle, pubic symphysis
I: ribs 5-7, xiphoid process
N: T7-T12
A: flexes trunk, posterior pelvic tilt
Pyramidalis
O:pubis
I: lower portion of linea alba
N: T12 spinal nerve
A: tenses linea alba
Transverse Abdominis
O: ribs 7-12, thoracolumbar fascia, ant 2/3 iliac crest, lateral 1/3 of inguinal ligament
I: linea alba via aponeuorosis, pectin pubis/ pubic tubercle via conjoint tendon
N: T7-T12, L1
A: constricts abdomen
Longus Capitis
O: trans process C3-C6
I: inferior surface of basilar part of occipital bone
N: ventral rami C1-C3
A: capital flexion, rot head to same side
Longus Coli (vertical)
O:anterior surface of bodies of first 3 thoracic and last cervical vertebrae
I: anterior surface of bodies of C2-C4
N: ventral rami C2-C6
A:cervical flexion
Longus Coli ( inferior oblique)
O:anterior surface of bodies of first 2 or 3 thoracic vertebrae
I: anterior tubercles of tran processes of C5-C6
N: ventral rami C2-C6
A: cervical flexion, cervical rotation to opposite side
Longus Coli (superior oblique)
O:anterior tubercles of trans process of C3-C5
I: tubercle on the anterior arch of the atlas
N: C2-C6 ventral rami
A: cervical flexion
