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Muscles of the Forearm that Move the Hand and Fingers

Muscles of the Forearm that Move the Hand and Fingers

The muscles of the forearm that move the wrist, hand, and digits are numerous and diverse. They can be classified into two groups based on their location and function — the anterior and posterior compartment muscles.
Anterior Compartment
The anterior compartment muscles originate from the humerus. They primarily function as flexors and are also known as flexor muscles. They typically insert on the carpals, metacarpals, and phalanges. The superficial layer includes the flexor carpi radialis,...

Alterations in Muscle Tone lll

Alterations in Muscle Tone lll

Rigidity and myotonia are distinct abnormalities of muscle tone that affect resistance and relaxation during movement. Although both involve altered muscle contraction, they arise from different neurological and muscular mechanisms.CharacteristicsRigidity is characterized by uniform resistance to passive movement across the entire range, independent of speed, affecting flexors and extensors equally. It may appear as lead-pipe rigidity (smooth, constant resistance) or cogwheel rigidity...

Bones of the Upper Limb: Ulna

Bones of the Upper Limb: Ulna

The ulna and radius are parallel bones of the antebrachium or the forearm. The ulna lies medially and consists of a bony tip called the olecranon process at its proximal end. This hook-like projection articulates with the olecranon fossa of the humerus and forms the "hinged" ulnohumeral part of the elbow joint. This joint facilitates forearm extension and flexion while preventing its hyperextension. Similarly, the coronoid process, another bony projection on the proximal/anterior side of the...

Bones of the Upper Limb: Humerus

Bones of the Upper Limb: Humerus

The upper limb consists of the arm, forearm, wrist, and hand bones. The humerus is the single bone of the upper arm region. Proximally, it has a large, spherical, smooth head that articulates with the glenoid cavity of the scapula to form the glenohumeral or shoulder joint. The margin of the head is the anatomical neck, a residual epiphyseal plate. Laterally it extends to form bony projections called the greater tubercle and the lesser tubercle. Next to the tubercles is the surgical neck, a...

Muscles that Move the Forearm

Muscles that Move the Forearm

The muscles that move the forearms can be divided into four groups: forearm flexors, forearm extensors, forearm pronators, and forearm supinators. The flexors and extensors act on the elbow joint, while the pronators and supinators act on the radioulnar joints.
Forearm Flexors
The biceps brachii, brachialis, and brachioradialis are forearm flexors. The biceps brachii is made up of two heads. Its long head originates at the supraglenoid tubercle of the scapula, whereas that of the short head is...

Spinal Nerves: Plexus I

Spinal Nerves: Plexus I

Nerve plexuses are networks of interlacing nerves that serve as communication hubs to distribute and organize nerve action across various body regions. The nerve plexuses are organized into the cervical plexus located in the neck region, brachial plexus in the shoulder area, lumbar plexus found in the lower back, sacral plexus situated in the pelvis, and coccygeal plexus located in the coccygeal region.
The Cervical Plexus
The cervical plexus, formed by the anterior rami of the first four...

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Related Experiment Video

Updated: May 23, 2026

$MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor$

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor

Published on: December 13, 2017

Upper limb tremor.

Thomas E Kimber¹, Philip D Thompson

¹Royal Adelaide Hospital, Adelaide, SA. thomas.kimber@health.sa.gov.au

The Medical Journal of Australia

|April 19, 2012

Summary

This summary is machine-generated.

Parkinson disease (PD) diagnosis relies on clinical assessment, not extensive tests. Treatment is individualized, balancing symptom relief with side effects for better management of this common tremor cause.

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A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception

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Published on: March 3, 2018

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Last Updated: May 23, 2026

$MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor$

MRI-guided Focused Ultrasound Thalamotomy for Patients with Medically-refractory Essential Tremor

Published on: December 13, 2017

A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception

A Simple Non-invasive Method for Temporary Knockdown of Upper Limb Proprioception

Published on: March 3, 2018

Area of Science:

Neurology
Geriatrics

Background:

Tremor is a frequent clinical issue in middle-aged and older adults.
Parkinson disease (PD) is a primary cause of tremor in this demographic.

Observation:

Diagnosis of PD typically requires thorough patient history and physical examination.
Extensive diagnostic investigations are generally unnecessary for PD diagnosis.

Findings:

Individualized PD treatment plans consider patient age, lifestyle, symptom severity, disability, comorbidities, and expectations.
Optimal medical therapy for PD involves combining dopaminergic medications to manage symptoms while minimizing adverse effects like dyskinesias and impulse-control disorders.

Implications:

For PD patients under 70 with persistent motor symptoms despite oral medication, continuous dopaminergic stimulation or deep brain stimulation are viable therapeutic options.
Personalized treatment strategies are crucial for effective Parkinson disease management and improving patient quality of life.