Logan Steele
The hypothenar muscles are a group of three muscles of the medial (ulnar) palmar compartment of the hand, which control the motion of the little finger. The hypothenar eminence muscles are innervated by the ulnar nerve (C8, T1). The ulnar nerve is responsible for supplying the three hypothenar muscles, and damage to it can lead to atrophy of the hypothenar eminence.
| Characteristics | Values |
|---|---|
| Number of Hypothenar Muscles | 3 or 4 |
| Names of Hypothenar Muscles | Abductor digiti minimi, flexor digiti minimi, opponens digiti minimi, and palmaris brevis |
| Innervation | Ulnar nerve (C8, T1) |
| Function | Control the motion of the little finger, allowing for flexion, abduction, lateral rotation, and opposition |
| Location | Medial (ulnar) palmar compartment of the hand |
| Type | Intrinsic muscles of the hand |
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What You'll Learn
- The ulnar nerve innervates the hypothenar muscles
- Ulnar nerve compromise causes weakness in finger abduction and adduction
- The hypothenar muscles are intrinsic muscles of the hand
- The hypothenar eminence is made up of four muscles
- The abductor digiti minimi muscle is innervated by the deep branch of the ulnar nerve
The ulnar nerve innervates the hypothenar muscles
The abductor digiti minimi muscle is the most superficial of the hypothenar muscle group. It originates from the pisiform and the tendon of the flexor carpi ulnaris and attaches to the base of the proximal phalanx of the little finger. This muscle is innervated by the deep branch of the ulnar nerve (C8, T1). The function of this muscle is to flex and abduct the fifth digit at its metacarpophalangeal joint and to flex it at its interphalangeal joint.
The flexor digiti minimi brevis muscle originates from the hook of the hamate bone and the medial aspect of the flexor retinaculum. It crosses the fifth metacarpophalangeal joint and inserts, along with the abductor digiti minimi, into the medial side of the base of the proximal phalanx of the little finger. This muscle shares the same innervation as the abductor digiti minimi, i.e., the deep branch of the ulnar nerve (C8, T1). The function of this muscle is to flex the fifth digit on the metacarpophalangeal joint and to participate in the lateral rotation and opposition of the little finger.
The opponens digiti minimi muscle lies deep to the abductor and flexor digiti minimi muscles. It originates from the hook of the hamate bone and flexor retinaculum and inserts into the ulnar side of the metacarpal bone 5. This muscle is innervated by the deep branch of the ulnar nerve. Its function is to flex the fifth digit on the metacarpophalangeal joint, as well as to laterally rotate and oppose the fifth digit.
The palmaris brevis muscle is innervated by the superficial branch of the ulnar nerve (C8, T1). It originates from the palmar aponeurosis and flexor retinaculum and attaches to the dermis of the skin on the medial margin of the hand. This muscle allows for the wrinkling of the skin on the palmar surface of the hand and deepens the hollow of the palm, protecting the neurovasculature of the ulnar canal.
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Ulnar nerve compromise causes weakness in finger abduction and adduction
The hypothenar muscles are a group of three muscles of the medial (ulnar) palmar compartment of the hand. They are the abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi muscles. A fourth muscle, the palmaris brevis, is also located in this region but is not part of the hypothenar muscle group. These muscles are innervated by the ulnar nerve.
The ulnar nerve is a branch of the median nerve that supplies the hypothenar muscles. It has two main branches: the deep branch (C8, T1) and the superficial branch (C8, T1). The deep branch innervates the abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi muscles. The superficial branch innervates the palmaris brevis muscle.
Ulnar nerve compromise at Guyon's canal causes weakness in finger abduction and adduction. It also causes weakness in flexion at the MCP and extension at the PIP, and adduction and flexion at the MCP of the thumb. This is because the hypothenar muscles are innervated by the ulnar nerve, and when there is a compromise in the nerve, it affects the function of the muscles it supplies.
The abductor digiti minimi muscle is responsible for abducting and flexing the fifth digit (little finger) at its metacarpophalangeal joint, as well as flexing it at its interphalangeal joint. The flexor digiti minimi brevis muscle helps to flex the fifth digit and participate in the lateral rotation and opposition of the little finger. The opponens digiti minimi muscle flexes the fifth digit and contributes to its lateral rotation and opposition.
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The hypothenar muscles are intrinsic muscles of the hand
The hypothenar muscles are a group of three muscles of the palm that control the motion of the little finger. They are intrinsic muscles of the hand, located within the hand itself. They are responsible for the fine motor functions of the hand. The three hypothenar muscles are the abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi muscles. The hypothenar eminence is made up of four muscles that contract to manifest motion through the little finger.
The abductor digiti minimi is the most superficial of the hypothenar muscle group. It originates from the pisiform and the tendon of the flexor carpi ulnaris and attaches to the base of the proximal phalanx of the little finger. The function of the abductor digiti minimi muscle is to flex and abduct the fifth digit at its metacarpophalangeal joint, as well as to flex it at its interphalangeal joint. The abductor digiti minimi muscle is innervated by the deep branch of the ulnar nerve (C8, T1).
The flexor digiti minimi brevis lies laterally to the abductor digiti minimi in the hand. It originates from the hook of hamate and adjacent flexor retinaculum and inserts into the base of the proximal phalanx of the little finger. The flexor digiti minimi brevis shares the same innervation as the abductor digiti minimi, i.e. the deep branch of the ulnar nerve (C8, T1).
The opponens digiti minimi lies deep to the other hypothenar muscles. It originates from the hook of hamate and flexor retinaculum and inserts into the ulnar side of the metacarpal bone 5. The opponens digiti minimi muscle is innervated by the deep branch of the ulnar nerve. Its function is to flex the fifth digit on the metacarpophalangeal joint, as well as to laterally rotate and oppose the fifth digit.
The hypothenar muscles are innervated by the ulnar nerve. The ulnar nerve has two branches: the deep branch and the superficial branch. The deep branch innervates the abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi muscles. The superficial branch innervates the palmaris brevis muscle, which is located in the same region as the hypothenar muscles but is not part of the hypothenar muscle group.
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The hypothenar eminence is made up of four muscles
The hypothenar eminence is a group of muscles in the palm of the hand that control the motion of the little finger. There are three hypothenar muscles: abductor digiti minimi, flexor digiti minimi brevis, and opponens digiti minimi. A fourth muscle, the palmaris brevis, is also located in this region, but it is typically classified as a separate, superficial muscle of the hypothenar eminence.
The abductor digiti minimi is the most superficial of the hypothenar muscle group. It originates from the pisiform and the tendon of the flexor carpi ulnaris and attaches to the base of the proximal phalanx of the little finger. This muscle abducts the little finger and is innervated by the deep branch of the ulnar nerve (C8, T1).
The flexor digiti minimi brevis lies laterally to the abductor digiti minimi. It originates from the hook of hamate and flexor retinaculum and inserts into the base of the proximal phalanx of the little finger. This muscle flexes the fifth digit at the metacarpophalangeal joint and participates in the lateral rotation and opposition of the little finger. Like the abductor digiti minimi, it is innervated by the deep branch of the ulnar nerve (C8, T1).
The opponens digiti minimi lies deep to the abductor and flexor digiti minimi muscles. It originates from the hook of hamate and flexor retinaculum and inserts into the ulnar side of the metacarpal bone 5. This muscle flexes the fifth digit at the metacarpophalangeal joint and laterally rotates and opposes the fifth digit. It is innervated by the deep branch of the ulnar nerve.
The palmaris brevis is a small, thin muscle found superficially in the subcutaneous tissue of the hypothenar eminence. It originates from the palmar aponeurosis and flexor retinaculum and attaches to the dermis of the skin on the medial margin of the hand. This muscle wrinkles the skin of the hypothenar eminence and deepens the curvature of the hand, improving grip. Unlike the other hypothenar muscles, the palmaris brevis is innervated by the superficial branch of the ulnar nerve (C8, T1).
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The abductor digiti minimi muscle is innervated by the deep branch of the ulnar nerve
The hypothenar muscles are a group of three muscles in the medial (ulnar) palmar compartment of the hand. They are the abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi muscles. A fourth muscle, the palmaris brevis, is also located in this region, but it is not part of the hypothenar muscle group. The hypothenar muscles are responsible for the motion of the little finger, including flexion, abduction, lateral rotation, and opposition.
The abductor digiti minimi muscle is the most superficial of the hypothenar muscle group. It originates from the pisiform and the tendon of the flexor carpi ulnaris and attaches to the base of the proximal phalanx of the little finger. The function of this muscle is to abduct the little finger.
The deep branch of the ulnar nerve that innervates the abductor digiti minimi muscle forms a loop with the flexor digiti minimi brevis muscle, as they are fused together. This loop is known as the intrahypothenar loop. The intrahypothenar loop is a regular pattern of nerve distribution, where nerve branches to muscles with fused bellies communicate with each other to form loops.
The ulnar nerve is susceptible to injury, which can lead to atrophy of the hypothenar eminence. This condition is known as hypothenar hammer syndrome, a vascular occlusion in the region. Compromise of the ulnar nerve can cause weakness in the abduction and adduction of the fingers, flexion at the MCP, and extension at the PIP, affecting the function of the hypothenar muscles.
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Frequently asked questions
The hypothenar muscles are innervated by the ulnar nerve.
The hypothenar muscles are a group of three muscles of the palm that control the motion of the little finger.
The hypothenar muscles are, from superficial to deep, the abductor digiti minimi, flexor digiti minimi, and opponens digiti minimi muscles.
