Pectineus Muscle

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Description

from the Latin word pecten, meaning comb^{[/en.wikipedia.org/wiki/Pectineus%20muscle [1]]}) is a flat, quadrangular muscle, situated at the anterior part of the upper and medial (inner) aspect of the thigh. The pectineus muscle is the most anterior adductor of the hip.  

It can be classified in the medial compartment of thigh^{[/en.wikipedia.org/wiki/Pectineus%20muscle [2]]} (when the function is emphasized) or theanterior compartment of thigh (when the nerve is emphasized).^{[/en.wikipedia.org/wiki/Pectineus%20muscle [3]]}

Origin

It has the most superior attachment of all the thigh adductors, originating from the pectineal line of pubis on the superior pubic ramus. The muscle then slides over the superior margin of superior pubic ramus and courses posterolaterally down the thigh, sometimes being partially divided into a larger anterior (superficial) layer and smaller posterior (deep) layer. The layers adhere to each other but are innervated by different nerves.

Insetion

Pectineus muscle inserts into the posterior surface of femur, along the pectineal line and proximal part of linea aspera. 

Nerve supply

Pectineus is predominately innervated by the[/www.kenhub.com/en/library/anatomy/femoral-nerve femoral nerve (L2, L3)]. However, in some people pectineus may receive innervation from two separate nerves of the [/www.kenhub.com/en/library/anatomy/lumbar-plexus lumbar plexus].

This composite innervation reflects the dual compartmentalisation of pectineus into both the anterior and medial compartments of the thigh. In these cases the anterior part of the muscle sits is innervated by the femoral nerve (L2, L3), a feature of muscles of the anterior thigh. While the posterior, smaller part of the muscle is supplied by a branch of obturator nerve (L2, L3), the accessory obturator nerve.

Blood supply

The superficial part of the muscle is supplied by the medial circumflex femoral artery, a branch of the femoral artery. Deep portion of the muscle is vascularised by the anterior branch of obturator artery, itself a branch of the internal iliac artery.

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