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ANATOMY / REFERENCE GALLERY1 / 2 references
This multipart figure shows the different muscles that move the forearm. The major muscle groups are labeled.
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Brachialis

Deep anterior arm elbow flexor inserting on the ulna.

Zoom in, then drag to inspect. Keyboard: + / − to zoom, arrows to pan, 0 to reset. Tap the numbered markers to explore parts.

This multipart figure shows the different muscles that move the forearm. The major muscle groups are labeled.

Image: OpenStax / University of Hawaiʻi adapted teaching figures; original contributors credited at source · Source / original · CC BY 4.0 — figure credits at source

Numbered markers and focused views are Mediveerse learning overlays; the original reference is linked above.

Brachialis

Shoulder & arm muscles

Brachialis

STRUCTURE & FUNCTION

Understand what you see.

A strong elbow flexor regardless of forearm pronation or supination.

Zoom into the original labels. Practise pointing out each structure, then explain it aloud. Diagrams are teaching references; specimen appearance and slide staining vary.

01 / IDENTIFICATION

How to recognise it.

  1. Deep to biceps
  2. Origin on anterior distal humerus
  3. Insertion onto proximal ulna
02 / KEY STRUCTURES

Point them out.

Tap a number to open its reference, zoom in and locate the structure. Numbers stay the same across views. This key follows landmarks visible in the reference images.

Related features & study points (3)

Additional relations, attachments or microscopic details to revise alongside this plate. These are separate from its numbered image landmarks.

  • Anterior humeral origin
  • Ulnar insertion
  • Musculocutaneous supply
03 / VIVA PRACTICE

Think first. Then reveal.

Say your answer aloud before opening the suggested response.

01How do you identify brachialis?
SUGGESTED ANSWER

Deep to biceps. Origin on anterior distal humerus. Insertion onto proximal ulna.

02Why does forearm rotation not alter its insertion as much as biceps?
SUGGESTED ANSWER

Brachialis inserts on ulna; biceps inserts on the rotating radius.

03Is its nerve supply always exclusively musculocutaneous?
SUGGESTED ANSWER

Most is musculocutaneous; a lateral portion often receives a radial nerve contribution.

04What is its main functional or developmental significance?
SUGGESTED ANSWER

A strong elbow flexor regardless of forearm pronation or supination. Key structures to recognise: Anterior humeral origin; Ulnar insertion; Musculocutaneous supply.

Read the references.

Credited anatomical plates, microscopy and university teaching references. Individual image credits appear below the viewer. Historical plates can use older terminology; use the lesson text for current names.