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    From Musculoskeletal System

    Sartorius
    Longest muscle in the body responsible for hip flexion.
    Inferior Nasal Conchae
    Bones inside the nasal cavity that filter and humidify air.
    Ulna
    Forearm bone on the pinky side.
    Hyoid Bone
    U-shaped bone in the neck that supports the tongue.
    Mandible
    Lower jawbone that houses the teeth.
    Skull
    Bony structure of the head that encases the brain.
    Biceps Brachii
    Muscle responsible for elbow flexion.
    Annular Ligament
    The annular ligament is a strong fibrous band encircling the head of the radius, stabilizing the proximal radioulnar joint and allowing smooth rotation of the forearm.
    Acetabulum
    The acetabulum is the pelvic socket that connects with the femoral head to form the hip joint, vital for stability, movement, and weight-bearing.
    Parietal Bones
    Bones forming the sides and roof of the skull.
    Ethmoid Bone
    Bone forming part of the nasal cavity and the orbit.
    Clavicle
    Collarbone connecting the arm to the body.
    Sphenoid Bone
    Bone forming part of the base of the skull and sides of the orbits.
    Gluteus Maximus
    Largest muscle in the buttocks responsible for hip extension.
    Gastrocnemius
    Calf muscle responsible for plantarflexion of the foot.
    Interspinous Ligament
    Spinal ligament between adjacent vertebral spinous processes.
    Anterior Longitudinal Ligament
    Spinal ligament running along the front of the vertebral column.
    Ligamentum Flavum
    Spinal ligament connecting the laminae of adjacent vertebrae.
    Quadriceps Tendon
    Tendon that connects the quadriceps to the patella.
    Metacarpals (5 bones)
    5 bones forming the palm of the hand.
    Latissimus Dorsi
    Back muscle responsible for arm adduction and extension.
    Sternocleidomastoid
    Muscle that rotates and flexes the neck.
    Pubis
    Part of the pelvis that joins with the opposite side to form the pubic symphysis.
    Carpals (8 bones)
    8 wrist bones.
    Biceps Tendon
    Tendon that attaches the biceps muscle to the bone.

    Brachioradialis

    Reviewed by our medical team

    Muscle responsible for forearm flexion.

    1. Overview

    The brachioradialis is a superficial muscle of the lateral forearm that plays a key role in elbow flexion. Although it anatomically belongs to the posterior (extensor) compartment of the forearm, it acts functionally as a flexor. It is most active when the forearm is in a mid-pronated (neutral) position, such as during a handshake or when lifting with a hammer grip. The brachioradialis is also useful in clinical assessments of the radial nerve through the brachioradialis reflex.

    2. Location

    The brachioradialis is located in the lateral aspect of the forearm, stretching from the arm to the distal forearm:

    • Origin: Lateral supracondylar ridge of the humerus, just above the lateral epicondyle.

    • Insertion: Lateral surface of the distal radius, near the styloid process.

    It lies superficially and forms the lateral border of the cubital fossa, visible and palpable when the elbow is flexed against resistance.

    3. Structure

    The brachioradialis has the following structural features:

    • Muscle type: Fusiform (spindle-shaped), with a long belly and narrow distal tendon.

    • Innervation: Radial nerve (C5–C6), despite its role as a flexor (most flexors are innervated by the musculocutaneous nerve).

    • Vascular supply: Receives blood from the radial recurrent artery.

    It does not cross the wrist joint and thus does not contribute to wrist movement.

    4. Function

    The brachioradialis performs the following functions:

    • Primary action: Flexes the elbow, especially when the forearm is in a neutral (midway between pronation and supination) position.

    • Secondary role: Assists in stabilizing the elbow during rapid or forceful flexion.

    • Minimal contribution: Weakly aids in pronation or supination to bring the forearm to the neutral position.

    5. Physiological role(s)

    The brachioradialis is involved in several physiological and functional activities:

    • Functional movements: Important in lifting objects, turning doorknobs, or using tools in a neutral grip.

    • Reflex testing: The brachioradialis reflex (C6) is used in neurological exams to test the integrity of the radial nerve and spinal cord segments.

    • Dynamic stability: Assists with elbow joint stability during fast upper limb motions.

    6. Clinical Significance

    The brachioradialis is involved in a number of clinical conditions and is important in diagnostics:

    • Brachioradialis reflex: A diminished or absent reflex may indicate radial nerve injury or C6 spinal nerve involvement.

    • Overuse injuries: May be strained in individuals who perform repetitive elbow flexion with a neutral grip, such as construction workers or athletes.

    • Radial tunnel syndrome: Compression of the radial nerve near the elbow may affect brachioradialis function, causing pain or weakness.

    • Differential diagnosis: Pain over the lateral forearm may mimic lateral epicondylitis (tennis elbow), but brachioradialis tenderness is more distal.

    Did you know? The human skeleton is made up of 206 bones at adulthood, but you are born with approximately 270 bones.