1st Metacarpal Bone

Authors

Affiliations

Nate Yomogida, PT, DPT

Doctor of Physical Therapy

B.S. in Kinesiology

Chloë Kerstein, PT, DPT

Doctor of Physical Therapy

B.A. in Neuroscience

Figure 1: Bones of the left hand (Anterior surface)¹

Figure 2: Bones of the left hand (posterior surface)¹

Figure 3: Plan of ossification of the hand¹

Figure 4: 1st metacarpal (left)¹

Muscular attachments

Table 1: Muscles inserting on the 1st metacarpal bone

Muscle	Origin	Insertion	Innervation	Action
Abductor pollicis longus	Dorsal Radius Dorsal Ulna IO membrane	1st metacarpal base	Radial n. C7 - C8	Radiocarpal joint: Radial dev. CMC & 1st MCP: Abduction
Opponens pollicis	Trapezium	1st metacarpal (radial border)	Median n. C8 - T1	CMC: Opposition

Table 2: Muscles originating from the 1st Metacarpal bone

Muscle	Origin	Insertion	Innervation	Action
1st Dorsal interossei (hand)	1-2nd MCP adjacent sides	2nd dorsal digital expansion 2nd Proximal Phalanx (radial border)	Ulnar n. C8 - T1	2nd digit: MCP Flexion, PIP & DIP Extension & Abduction

The Archive/Anatomy/Bones/Upper Extremity Bones/Metacarpal bones/1st_metacarpal_bone.qmd

References

1.

Gray H. Anatomy of the Human Body. 20th ed. (Lewis WH, ed.). Lea & Febiger; 1918. https://www.bartleby.com/107/