Scalenus Minimus

Original Editor - Wendy Walker

Top Contributors - Vanessa Rhule, Wendy Walker and Evan Thomas

Description

Part of the Scalene group of lateral neck muscles,this muscle is absent in a large percentage of the population.
Cadaver studies report finding it on one side in between 7%[1] and 46%[2] of the population.
AKA Albinus Muscle, Sibson Muscle.
Scalenus minimus.jpg

Origin

C7

Anterior tubercle of transverse process of 7th cervical vertebra

Insertion

1st Rib and suprapleural fascia

Nerve Supply

Branches of the ventral rami of cervical spinal nerves 7 & 8

Blood Supply

Subclavian artery, suprascapular artery and superficial cervical artery

Action

Acting from above, in conjuction with Anterior Scalene and Middle Scalene: elevation of 1st rib

Helps raise and tense the dome of the parietal pleura

Function

Accessory muscle of inspiration

Recent Related Research

References

  1. Am Surg. 2013 Apr;79(4):372-4. Scalenus minimus muscle: overestimated or not? An anatomical study. Natsis K, Totlis T, Didagelos M, Tsakotos G, Vlassis K, Skandalakis P.
  2. Walter G. Harry, John D.C. Bennett, Somes C. GuhafckLRScalene muscles and the brachial plexus: Anatomical variations and their clinical significance Clinical Anatomy Volume 10, Issue 4, pages 250–252, 1997