Pectineus muscle

Source: Wikipedia, the free encyclopedia.
Pectineus
adduction, external rotation
Identifiers
Latinmusculus pectineus
TA98A04.7.02.025
TA22627
FMA22440
Anatomical terms of muscle]

The pectineus muscle (

internal rotation
of the hip.

It can be classified in the medial compartment of thigh[2] (when the function is emphasized) or the anterior compartment of thigh (when the nerve is emphasized).[3]

Structure

The pectineus muscle arises from the

iliopectineal eminence and pubic tubercle, and from the fascia covering the anterior surface of the muscle; the fibers pass downward, backward, and lateral, to be inserted into the pectineal line of the femur which leads from the lesser trochanter to the linea aspera
.

Relations

The pectineus is in relation by its anterior surface with the pubic portion of the

profunda femoris artery
.

By its posterior surface with the

vein
being interposed.

By its external border with the

psoas major, the femoral artery
resting upon the line of interval.

By its internal border with the outer edge of the

adductor longus
.

Obturator foramen is situated directly behind this muscle, which forms one of its coverings.[4]

It forms part of the floor of the femoral triangle.

Innervation

The lumbar plexus is formed from the anterior rami of nerves L1 to L4 and some fibers from T12. With only five roots and two divisions, it is less complex than the brachial plexus and gives rise to a number of nerves including the femoral nerve and accessory obturator nerve. The pectineus muscle is considered a composite muscle as the innervation is by the femoral nerve (L2 and L3) and occasionally (20% of the population) a branch of the obturator nerve called the accessory obturator nerve. When it is present, the accessory obturator nerve innervates a portion of the pectineus muscle, entering the muscle on its dorsomedial aspect. The greater nerve to the muscle is the femoral nerve. Unlike the obturator accessory nerve, the femoral nerve is always present and provides the sole innervation for the pectineus muscle in over 90% of cases. The muscle is also innervated by the accessory obturator nerve in the 8.7% of cases in which the nerve occurs.[5]

Function

Its primary functions are contributing to

internally rotates the thigh.[6]

Additional images

  • Right hip bone. External surface.
    Right hip bone. External surface.
  • Structures surrounding right hip-joint.
    Structures surrounding right hip-joint.
  • Muscles of the iliac and anterior femoral regions.
    Muscles of the iliac and anterior femoral regions.
  • Deep muscles of the medial femoral region.
    Deep muscles of the medial femoral region.
  • The left femoral triangle.
    The left femoral triangle.
  • The lumbar plexus and its branches.
    The lumbar plexus and its branches.
  • Pectineus muscle
    Pectineus muscle
  • Pectineus muscle
    Pectineus muscle
  • Pectineus muscle
    Pectineus muscle
  • Pectineus muscle
    Pectineus muscle
  • Pectineus muscle
    Pectineus muscle
  • Muscles of Thigh. Anterior views
    Muscles of Thigh. Anterior views
  • Muscles of Thigh. Anterior views.
    Muscles of Thigh. Anterior views.

See also

This article uses anatomical terminology.

References

Public domain This article incorporates text in the public domain from page 472 of the 20th edition of Gray's Anatomy (1918)

  1. Mosby's Medical, Nursing & Allied Health Dictionary
    , Fourth Edition, Mosby-Year Book Inc., 1994, p. 1177
  2. ISBN 0-443-07168-3
    .
  3. ^ medialthigh at The Anatomy Lesson by Wesley Norman (Georgetown University)
  4. ^ Wilson, Erasmus (1851). The anatomist's vade mecum: a system of human anatomy. John Churchill. p. 260.
  5. ^ RUSSELL T., WOODBURNE. "The Accessory Obturator Nerve and the Innervation of the Pectineus Muscle" (PDF): 367. {{cite journal}}: Cite journal requires |journal= (help)
  6. PMID 20118525
    .

Notes

External links
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