Flexor Digiti Minimi Brevis: Difference between revisions
No edit summary |
No edit summary |
||
| Line 5: | Line 5: | ||
</div> | </div> | ||
== Description == | == Description == | ||
" | The word "thenar" is a Greek word that means "fleshy mounds." The word thenar refers to the two fleshy bumps on the palmar surface of the hand. The fleshy mound at the base of the thumb is known as the thenar eminence. The hump at the base of the fifth digit is known as the hypothenar eminence (little finger).Muscles make up the eminences on either side of the hand. The thenar eminence muscles are primarily responsible for controlling the thumb. The hypothenar eminence muscles will contract and exhibit motion through the little finger. | ||
The hypothenar eminence is made up of four muscles. The four muscles are | The hypothenar eminence is made up of four muscles. The four muscles are | ||
Revision as of 18:46, 5 December 2021
Original Editor - User Name
Top Contributors - Rishika Babburu, Sameera Withanage and Oyemi Sillo
Description[edit | edit source]
The word "thenar" is a Greek word that means "fleshy mounds." The word thenar refers to the two fleshy bumps on the palmar surface of the hand. The fleshy mound at the base of the thumb is known as the thenar eminence. The hump at the base of the fifth digit is known as the hypothenar eminence (little finger).Muscles make up the eminences on either side of the hand. The thenar eminence muscles are primarily responsible for controlling the thumb. The hypothenar eminence muscles will contract and exhibit motion through the little finger.
The hypothenar eminence is made up of four muscles. The four muscles are
- The abductor digiti minimi muscle,
- The flexor digiti minimi brevis muscle,
- The opponens digiti minimi muscle, and
- The palmaris brevis muscle. [1]
Origin[edit | edit source]
The muscle originates from the hook of hamate and flexor retinaculum (Transverse carpal ligament) .This muscle lies laterally to the abductor digiti minimi.[2]
Insertion[edit | edit source]
It inserts into the medial side of base of the proximal phalanx of the little finger.
Nerve[edit | edit source]
Deep branch of Ulnar nerve
Artery[edit | edit source]
Ulnar artery
Function[edit | edit source]
Flexes the Metacarpophalangeal joint of the little finger.
Clinical relevance[edit | edit source]
The ulnar nerve can become compressed when it travels between the hook of the hamate and the pisiform bone (Guyon's canal). Cyclists, for example, can injure the ulnar nerve by applying direct pressure to the Guyon canal. Atrophy, numbness, tingling, and discomfort in the hypothenar eminence, as well as the fourth and fifth fingers, are all symptoms of ulnar nerve damage. The ulnar nerve is affected in this disorder, which is similar to "carpal tunnel syndrome." [3]
If the ulnar artery is compromised and collateral blood flow is insufficient, the hypothenar eminence can be injured. The "hypothenar hammer syndrome" is the name given to this condition. Individuals who labour with instruments that need tight grasping and repetitive pounding are more likely to develop this illness. The firm grip and pounding of tools will induce a rebound effect on the hypothenar eminence's vascular blood supply. If the blood supply is jeopardised,.[4][5]
Resources[edit | edit source]
- ↑ https://www.ncbi.nlm.nih.gov/books/NBK546622/
- ↑ https://teachmeanatomy.info/upper-limb/muscles/hand/
- ↑ Ramage JL, Varacallo M. StatPearls [Internet]. StatPearls Publishing; Treasure Island (FL): Sep 8, 2020. Anatomy, Shoulder and Upper Limb, Hand Guyon Canal.
- ↑ Kitzinger HB, van Schoonhoven J, Schmitt R, Hacker S, Karle B. Hypothenar Hammer Syndrome: Long-Term Results After Vascular Reconstruction. Ann Plast Surg. 2016 Jan;76(1):40-5.
- ↑ Zhang F, Weerakkody Y, Tosenovsky P. Hypothenar hammer syndrome in an office worker. J Med Imaging Radiat Oncol. 2017 Dec;61(6):774-776.
