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The hypothenar muscles are a group of three or four muscles in the palm that control the motion of the little finger. They are intrinsic muscles, meaning their origin and insertion are within the carpal and metacarpal bones. The hypothenar muscles are innervated by the ulnar nerve, except for the palmaris brevis, which is supplied by the superficial branch of the ulnar nerve. Injury to the ulnar nerve can cause paralysis and atrophy of the hypothenar muscles, resulting in a loss of sensory and motor function in the region.
| Characteristics | Values |
|---|---|
| Number of Hypothenar Muscles | 3 or 4 |
| Function | Control the motion of the little finger |
| Blood Supply | Ulnar artery via the superficial palmar arch |
| Innervation | Ulnar nerve (C8, T1) |
| Superficial Branch of Ulnar Nerve Supplies | Palmaris brevis muscle |
| Deep Branch of Ulnar Nerve Supplies | Abductor digiti minimi, flexor digiti minimi brevis, opponens digiti minimi |
| Ulnar Nerve Entrapment | Guyon's canal |
| Ulnar Nerve Entrapment Symptoms | Pain, disturbed sensation, paralysis, atrophy of hypothenar muscles |
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What You'll Learn
The deep branch of the ulnar nerve
The hypothenar muscles are a group of three muscles in the palm that control the motion of the little finger. The ulnar nerve is a major peripheral nerve of the upper limb that arises from the brachial plexus within the axilla region. It is a continuation of the medial cord and contains fibres from spinal roots C8 and T1. The ulnar nerve bifurcates into superficial and deep branches within the Guyon's canal.
Ulnar nerve compromise at the Guyon's canal can cause weakness in the abduction and adduction of the fingers, flexion at the MCP, extension at the PIP, and adduction and flexion at the MCP of the thumb. This can lead to atrophy of the hypothenar eminence and loss of sensory and motor function in the region. Ulnar nerve repair requires knowledge of its course in the Guyon's canal to prevent nerve damage during surgery.
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Ulnar nerve compromise
The ulnar nerve is a branch of the brachial plexus nerve system that travels down the back and inside of the arm to the hand. It is responsible for transmitting electrical signals to muscles in the forearm and hand, as well as providing sensation in the ring and little fingers. Ulnar nerve entrapment, or compromise, occurs when the nerve becomes compressed, typically at the elbow or wrist. This compression can result from prolonged stretching of the nerve by keeping the elbow bent or direct pressure on the nerve from leaning the elbow or wrist against a surface.
The ulnar nerve is crucial for innervating the hypothenar muscles, which are a group of three muscles in the palm that control the motion of the little finger. These muscles include the opponens digiti minimi, flexor digiti minimi brevis, and abductor digiti minimi. The deep branch of the ulnar nerve innervates these muscles, allowing for flexion, abduction, lateral rotation, and opposition of the little finger.
When ulnar nerve compromise occurs, it can lead to atrophy of the hypothenar eminence and loss of sensory and motor function in the region. This is due to the disruption of the nerve's ability to transmit electrical signals and relay sensory information to and from the central nervous system. As a result, patients may experience weakness in the abduction and adduction of the fingers, flexion at the MCP, and extension at the PIP, affecting the fine motor movements of the hand.
To diagnose ulnar nerve compromise, special tests with high sensitivity are utilised to rule out other conditions. Treatment options depend on the severity of the entrapment and can range from conservative management, including splinting and manual therapy, to surgical intervention. Early conservative treatment has been proven effective and can increase the chances of avoiding surgery.
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The palmaris brevis muscle
The muscle fibres of the palmaris brevis originate from the fibrous structures of the hand, specifically the tendinous fasciculi from the transverse carpal ligament and palmar aponeurosis. These fibres are then inserted into the skin on the ulnar border of the palm, and sometimes the pisiform bone. The primary function of the palmaris brevis muscle is to tighten the palmar aponeurosis, which contributes to the strength of one's grip. This action also wrinkles the skin of the hypothenar eminence transversally, deepens the hollow of the palm, and protects the neurovasculature of the ulnar canal.
The palmaris brevis is not considered part of the hypothenar muscle group, which consists of muscles that control the motion of the little finger. Instead, it is classified separately as an outstanding superficial muscle of the region. This distinction is made because the palmaris brevis does not primarily act on the fifth digit. However, it does play a role in positioning and stabilising the palm during a spherical power grip, where the hand is posed in a cup-like formation.
The blood supply to the palmaris brevis muscle comes from the palmar metacarpal artery of the deep palmar arch, with some individuals also receiving contributions from other arteries, such as the radial artery or princeps pollicis artery. The first recorded observation of the muscle was made by Italian anatomist Giambattista Canano sometime before 1543.
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The abductor digiti minimi muscle
It is worth noting that the abductor digiti minimi muscle is part of the hypothenar muscles, which are a group of three muscles in the palm that control the motion of the little finger. These muscles contribute to various movements of the little finger, including flexion, abduction, lateral rotation, and opposition.
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The flexor digiti minimi brevis muscle
The flexor digiti minimi brevis is a hypothenar muscle in the hand that controls the movement of the little finger (digit V) at the metacarpophalangeal joint. It is a short, intrinsic muscle, arising from the hook of the hamate bone and flexor retinaculum. The muscle fibres run distally and medially, passing over the fifth metacarpophalangeal joint.
The flexor digiti minimi brevis is one of three muscles in the hypothenar muscle group, along with the abductor digiti minimi and opponens digiti minimi. These muscles form the hypothenar eminence, a fleshy mass at the base of the little finger. The flexor digiti minimi brevis lies lateral to the abductor digiti minimi when the hand is in anatomical position. The proximal parts of these two muscles form a gap through which the deep branches of the ulnar artery and ulnar nerve pass.
The flexor digiti minimi brevis is innervated by the deep branch of the ulnar nerve (C8-T1). The ulnar nerve arises from the spinal nerve levels C8-T1, with the spinal roots merging to form the lower trunk, anterior division, and medial cord, eventually producing the ulnar nerve. The nerve has both a superficial and deep branch, with the deep branch innervating the flexor digiti minimi brevis.
The main function of the flexor digiti minimi brevis is to flex the little finger at the metacarpophalangeal joint, allowing for flexion, abduction, lateral rotation, and opposition of the little finger. This muscle, along with the abductor digiti minimi, inserts into the medial side of the base of the proximal phalanx of the little finger. The flexor digiti minimi brevis is sometimes not present in individuals, and in these cases, the abductor digiti minimi is typically larger than normal.
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Frequently asked questions
The hypothenar muscles are innervated by the ulnar nerve.
The hypothenar muscles are a group of three or four muscles of the palm that control the motion of the little finger.
The function of the hypothenar muscles is to raise and curl the ulnar border of the hand, such as when cupping the hand to collect water. They also contribute to the variety of movements of the little finger, including flexion, abduction, lateral rotation, and opposition.
Injury to the ulnar nerve can lead to atrophy of the hypothenar eminence and loss of sensory and motor function in the region. It can also cause paralysis and atrophy of the hypothenar muscles, resulting in a significant impact on hand function.
