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Pectineus muscle

From Wikipedia, the free encyclopedia

Pectineus
The pectineus and nearby muscles
Structures passing behind the inguinal ligament (pectineus visible at bottom right.)
Details
OriginPectineal line of the pubic bone
InsertionPectineal line of the femur
ArteryObturator artery
NerveFemoral nerve, sometimes obturator nerve
ActionsThigh - flexion, adduction, external rotation
Identifiers
Latinmusculus pectineus
TA98A04.7.02.025
TA22627
FMA22440
Anatomical terms of muscle

The pectineus muscle (/pɛkˈtɪniəs/, from the Latin word pecten, meaning comb)[1] is a flat, quadrangular muscle, situated at the anterior (front) part of the upper and medial (inner) aspect of the thigh. The pectineus muscle is the most anterior adductor of the hip. The muscle's primary action is hip flexion; it also produces adduction and 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]

YouTube Encyclopedic

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Transcription

Hello again, everyone. It’s Matt from Kenhub! And in this tutorial, we will discuss the pectineus muscle. The pectineus muscle is one of the six hip adductors. It runs from the superior pubic ramus to the pectineal line and linea aspera of the femur. The adductors of the hip are part of the inner hip musculature, and they range from the lower pelvic bone to the femur and knee region, thus lying between the extensor and flexor group of the thigh muscles. The hip adductors shape the surface anatomy of the medial thigh. The innervation is mainly supplied by the obturator nerve which arises from the lumbar plexus and reaches the adductors through the obturator canal. The pectineus muscle is additionally innervated by the femoral nerve. As the name suggests, the main function of the hip adductors is the adduction of the hip joint. The pectineus muscle also supports external rotation and flexion. The hip adductors are particularly used when crossing ones legs. Overall, they play an important role in balancing the pelvis during standing and walking. This video is more fun than reading a textbook, right? If you want more videos, interactive quizzes, articles, and an atlas of human anatomy, click on the “Take me to Kenhub” button. It is time to say goodbye to your old textbooks and say hello to your new anatomy learning partner, Kenhub! See you there! https://www.kenhub.com

Structure

The pectineus muscle arises from the pectineal line of the pubis and to a slight extent from the surface of bone in front of it, between 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 fascia lata, which separates it from the femoral artery and vein and internal saphenous vein, and lower down with the profunda femoris artery.

By its posterior surface with the capsule of the hip joint, and with the obturator externus and adductor brevis, the obturator artery and 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 hip flexion and hip adduction. Secondarily, it also internally rotates the thigh.[6]

Additional images

See also

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. ^ Ellis, Harold; Susan Standring; Gray, Henry David (2005). Gray's anatomy: the anatomical basis of clinical practice. St. Louis, Mo: Elsevier Churchill Livingstone. p. 518. 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. ^ Neumann, DA (February 2010). "Kinesiology of the hip: a focus on muscular actions". The Journal of Orthopaedic and Sports Physical Therapy. 40 (2): 82–94. doi:10.2519/jospt.2010.3025. PMID 20118525.

Notes

External links

This page was last edited on 19 January 2024, at 16:19
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