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ANATOMY / REFERENCE GALLERY1 / 1 reference
This multipart figure shows the intrinsic muscles of the hand with the major muscle groups labeled.
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Abductor pollicis brevis

Locate abductor pollicis brevis on this anatomical reference. Read the original plate labels to confirm the view and adjacent structures.

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 intrinsic muscles of the hand with the major muscle groups 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.

Lumbricals of hand

Hand & wrist

Lumbricals of hand

STRUCTURE & FUNCTION

Understand what you see.

Flex MCP joints while extending interphalangeal joints through the extensor apparatus.

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. Four slender muscles from FDP tendons
  2. Insert into extensor expansions
  3. Run beside metacarpals
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.

  • FDP tendon origins
  • Extensor expansion
  • Median and ulnar innervation
03 / VIVA PRACTICE

Think first. Then reveal.

Say your answer aloud before opening the suggested response.

01How do you identify lumbricals of hand?
SUGGESTED ANSWER

Four slender muscles from FDP tendons. Insert into extensor expansions. Run beside metacarpals.

02Describe their motor supply.
SUGGESTED ANSWER

First two are usually median; medial two are deep ulnar.

03Why is simultaneous MCP flexion and IP extension possible?
SUGGESTED ANSWER

Their tendons pass on the flexor side of MCP axes and join the dorsal extensor expansions.

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

Flex MCP joints while extending interphalangeal joints through the extensor apparatus. Key structures to recognise: FDP tendon origins; Extensor expansion; Median and ulnar innervation.

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.