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Lower Limb: Posterior Compartment

The document summarizes details about the psoas major muscle. It originates from the transverse processes of the lumbar vertebrae and inserts onto the lesser trochanter of the femur. It functions to flex and laterally rotate the thigh at the hip. The psoas major lies deep in the posterior abdominal wall and posterior to the diaphragm. It is innervated by branches from the lumbar plexus, specifically the anterior rami of spinal nerves L1-L3.

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16 views5 pages

Lower Limb: Posterior Compartment

The document summarizes details about the psoas major muscle. It originates from the transverse processes of the lumbar vertebrae and inserts onto the lesser trochanter of the femur. It functions to flex and laterally rotate the thigh at the hip. The psoas major lies deep in the posterior abdominal wall and posterior to the diaphragm. It is innervated by branches from the lumbar plexus, specifically the anterior rami of spinal nerves L1-L3.

Uploaded by

rukhsanatariq299
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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LOWER LIMB

Posterior compartment :
POSTERIOR COMPARTMENT MUSCLES

PSOAS MAJOR :

PSOAS MAJOR IS A LONG, THICK, FUSIFORM MUSCLE LOCATED IN


THE LUMBAR REGION OF THE TRUNK IT BELONGS TO THE INNER MUSCLES
OF THE HIP GROUP.THE NAME ‘PSOAS’ IS OF GREEK ORIGIN MEANING
‘MUSCLE OF THE LOIN’.

Origin :

Psoas major is a long muscle located immediately lateral to the vertebral


column. It has an extensive origin from the:

 Transverse processes of all the lumbar vertebrae

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 Vertebral bodies of T12-L5
 Intervening intervertebral discs
 The fibres of psoas major extend inferolaterally through the lesser pelvis towards
the thigh.

Insertion :
The lateral-most fibres of psoas major fuse with the fibres of the iliacus muscle to
form the iliopsoas muscle. Iliopsoas passes deep to the inguinal ligament and
anterior to the joint capsule of the hip to insert onto the LESSER TROCHANTER
OF THE FEMUR
Relations :
 Psoas major lies posterior to the diaphragm.
 Quadratus lumborum is located lateral to the muscle
 The inferior vena cava is located medial
 The sympathetic trunk and aortic lymph nodes are also located medially.

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Fig # Superior view

Innervation :

Psoas major is innervated by branches of the lumbar plexus. These are the anterior
branches of spinal nerves L1-L3.

 Anterior rami of spinal nerves L1-L3

Functions :

The actions of psoas major are flexion and lateral rotation of the thigh at the hip.

 During standing, it stabilizes the vertebral column

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