5th 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: 5th metacarpal (left)¹

Muscular attachments

Table 1: Muscles inserting on the 5th Metacarpal bone

Muscle	Origin	Insertion	Innervation	Action
Extensor carpi ulnaris	Lateral epicondyle of Humerus Ulnar head	5th metacarpal base	Radial n. C7 - C8	Wrist: Extension, Ulnar deviation
Flexor carpi ulnaris	Medial epicondyle Olecranon	Hook of Hamate Base of 5th metacarpal	Ulnar n. C7 - T1	Wrist: Flexion, Ulnar deviation

Table 2: Muscles originating from the 5th Metacarpal bone

Muscle	Origin	Insertion	Innervation	Action
3rd Palmar interossei (hand)	5th MCP (radial side)	5th dorsal digital expansion 5th Proximal Phalanx (radial border)	Ulnar n. C8 - T1	5th digit: MCP Flexion, PIP & DIP Extension & Adduction
4th Dorsal interossei (hand)	4-5th MCP adjacent sides	5th dorsal digital expansion 5th Proximal Phalanx (radial border)	Ulnar n. C8 - T1	5th digit: MCP Flexion, PIP & DIP Extension & Abduction

References

1.

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