Dorsal Interossei of the Hand: Difference between revisions
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'''Top Contributors''' - {{Special:Contributors/{{FULLPAGENAME}}}} | '''Top Contributors''' - {{Special:Contributors/{{FULLPAGENAME}}}} | ||
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== Description [[Image:Dorsal interossei of the hand.png|border|right]] | == Description == | ||
[[Image:Dorsal interossei of the hand.png|border|right]] | |||
In the hand there are four dorsal Interossei which lie superficially, | In the hand, there are four dorsal Interossei which lie superficially, in between the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. The position of the insertion site is dependent on which digit is involved. On the first and second digit, the muscle lies on the lateral side and in the third and fourth digit, it lies off the medial side. <ref name="Palastanga et al">Palastanga N, Field D, Soames R. Anatomy and human movement. Structure and function. 5th ed. London: Butterworth Heinemann Elsevier, 2006.</ref><br> | ||
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=== Origins and Insertions <ref name="Drake et al" /> === | === Origins and Insertions <ref name="Drake et al" /> === | ||
{| width="531" cellspacing="1" cellpadding="1" border="1" align="center" | {| class="wikitable" width="531" cellspacing="1" cellpadding="1" border="1" align="center" | ||
|- | |- | ||
! Muscle<br> | |||
! Origin<br> | |||
! Insertion <br> | |||
|- | |- | ||
| 1st <br> | | 1st <br> | ||
| | | | ||
The medial side of the proximal end of the first metacarpal and lateral side of the second metacarpal <br> | |||
| Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood)<br> | | Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood)<br> | ||
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| 3rd <br> | | 3rd <br> | ||
| Medial side of the third metacarpal and lateral side of the fourth metacarpal<br> | | Medial side of the third metacarpal and lateral side of the fourth metacarpal<br> | ||
| Medial side of the base of the third proximal phalanx and the extensor | | Medial side of the base of the third proximal phalanx and the extensor expansion <br> | ||
|- | |- | ||
| 4th <br> | | 4th <br> | ||
| Medial side of the fourth metacarpal and lateral side of the fifth metacarpal <br> | | Medial side of the fourth metacarpal and lateral side of the fifth metacarpal <br> | ||
| Medial side of the base of the fourth proximal phalanx and the extensor | | Medial side of the base of the fourth proximal phalanx and the extensor expansion <br> | ||
|} | |} | ||
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=== Nerve Supply === | === Nerve Supply === | ||
The Dorsal Interossei muscles of the hand are all supplied by the deep branch of the ulnar nerve (C8, T1) | The Dorsal Interossei muscles of the hand are all supplied by the deep branch of the [[Ulnar Nerve|ulnar nerve]] (C8, T1) <ref name="Palastanga et al" />.<br> | ||
=== Blood Supply === | === Blood Supply === | ||
The Dorsal Interossei muscles of the hand are supplied by the dorsal and palmar interossei artery <ref name="Palastanga et al" /><br> | The Dorsal Interossei muscles of the hand are supplied by the dorsal and palmar interossei artery <ref name="Palastanga et al" />.<br> | ||
=== | === Function === | ||
The dorsal interossei muscles are muscles that abduct the second, third and fourth digits. The first digit and the fifth digit have their own abductor muscles in the thenar and | The dorsal interossei muscles are muscles that abduct the second, third and fourth digits. The first digit and the fifth digit have their own abductor muscles in the [[Thenar and Hypothenar Muscles Of The Hand|thenar and hypothenar]] eminence and so do not have interossei musculature <ref name="Drake et al">Drake RL, Vogl W, Mitchell AWM. Gray's anatomy for students. London: Churchill Livingstone.</ref>.<br> | ||
=== Functional contributions === | === Functional contributions === | ||
As the dorsal interossei muscles | As the dorsal interossei muscles attach to the extensor expansion (extensor hood) of the digits, it also assists in addition to the lumbricals in producing flexion and extension of the metacarpophalangeal and interphalangeal joints <ref name="Drake et al" />. | ||
=== | === Assessment === | ||
The dorsal interossei muscles can be palpated in the dorsum of the hand on resisted abduction of the fingers between the metacarpals<ref name="Palastanga et al" />. | |||
The dorsal | The first dorsal interosseous muscle can be tested by placing the patient's palm flat on a table and asking the patient to abduct his/her index finger against the examiner's resistance. The muscle belly can be both seen and palpated and is a reliable test for the [[Ulnar Nerve|ulnar nerve]]. | ||
{{#ev:youtube|cn1Vp9FawKI}}<ref name="KenHub">KenHub. Dorsal interossei muscles of the hand- Human anatomy. Available from: https://www.youtube.com/watch?v=cn1Vp9FawKI (last accessed 14/2/2016).</ref> | |||
{{#ev:youtube|cn1Vp9FawKI}}<ref name="KenHub"> KenHub. Dorsal interossei muscles of the hand- Human anatomy. Available from : https://www.youtube.com/watch?v=cn1Vp9FawKI (last accessed 14/2/2016) | |||
== References == | == References == | ||
<references /> | |||
[[Category:Anatomy]] | |||
[[Category:Muscles]] | |||
[[Category:Hand]] | |||
[[Category:Hand - Anatomy]] | |||
[[Category: Hand - Muscles]] |
Latest revision as of 18:29, 12 November 2020
Original Editor - Kate Sampson
Top Contributors - Kate Sampson, Olajumoke Ogunleye, Kim Jackson, Tony Lowe, Tomer Yona, Joao Costa, 127.0.0.1, George Prudden and WikiSysop
Description[edit | edit source]
In the hand, there are four dorsal Interossei which lie superficially, in between the metacarpals on the dorsum of the hand. Each muscle is bipennate in shape and extends from the proximal ends of adjacent metacarpals to the proximal phalanx and dorsal digital expansion of the appropriate finger. The position of the insertion site is dependent on which digit is involved. On the first and second digit, the muscle lies on the lateral side and in the third and fourth digit, it lies off the medial side. [1]
Origins and Insertions [2][edit | edit source]
Muscle |
Origin |
Insertion |
---|---|---|
1st |
The medial side of the proximal end of the first metacarpal and lateral side of the second metacarpal |
Lateral side of the base of the second proximal phalanx and the extensor expansion (Extensor Hood) |
2nd |
Medial side of the second metacarpal and lateral side of the third metacarpal |
Lateral side of the base of the third proximal phalanx and the extensor expansion |
3rd |
Medial side of the third metacarpal and lateral side of the fourth metacarpal |
Medial side of the base of the third proximal phalanx and the extensor expansion |
4th |
Medial side of the fourth metacarpal and lateral side of the fifth metacarpal |
Medial side of the base of the fourth proximal phalanx and the extensor expansion |
Nerve Supply[edit | edit source]
The Dorsal Interossei muscles of the hand are all supplied by the deep branch of the ulnar nerve (C8, T1) [1].
Blood Supply[edit | edit source]
The Dorsal Interossei muscles of the hand are supplied by the dorsal and palmar interossei artery [1].
Function[edit | edit source]
The dorsal interossei muscles are muscles that abduct the second, third and fourth digits. The first digit and the fifth digit have their own abductor muscles in the thenar and hypothenar eminence and so do not have interossei musculature [2].
Functional contributions[edit | edit source]
As the dorsal interossei muscles attach to the extensor expansion (extensor hood) of the digits, it also assists in addition to the lumbricals in producing flexion and extension of the metacarpophalangeal and interphalangeal joints [2].
Assessment[edit | edit source]
The dorsal interossei muscles can be palpated in the dorsum of the hand on resisted abduction of the fingers between the metacarpals[1].
The first dorsal interosseous muscle can be tested by placing the patient's palm flat on a table and asking the patient to abduct his/her index finger against the examiner's resistance. The muscle belly can be both seen and palpated and is a reliable test for the ulnar nerve.
References[edit | edit source]
- ↑ 1.0 1.1 1.2 1.3 Palastanga N, Field D, Soames R. Anatomy and human movement. Structure and function. 5th ed. London: Butterworth Heinemann Elsevier, 2006.
- ↑ 2.0 2.1 2.2 Drake RL, Vogl W, Mitchell AWM. Gray's anatomy for students. London: Churchill Livingstone.
- ↑ KenHub. Dorsal interossei muscles of the hand- Human anatomy. Available from: https://www.youtube.com/watch?v=cn1Vp9FawKI (last accessed 14/2/2016).