What Does the Fourth Metatarsal Bone Refer to?
The elongated bone positioned at the proximal end of the fourth proximal phalanx is known as the fourth metatarsal bone. Being the third longest among all the metatarsals, it is linked to the fourth toe and is similar to the fourth metacarpal bone in the hand.
Structure and Significant Points
It comprises a head, body, and base.
Connections
At its base, the fourth metatarsal bone has three articular facets. The quadrilateral facet connects to the cuboid bone. The oval facet, positioned medially, acts as the point of articulation with the third metatarsal. There exists a bony ridge that separates the oval facet from another smooth facet on the lateral side of the bone, which articulates with the fifth metatarsal.
On the distal end, the head of the fourth metatarsal bone articulates with the fourth proximal phalanx.
Muscular Attachment
- The 1st plantar interosseus muscle attaches to the medial side of the body of the fourth metatarsal bone.
- The 2nd dorsal interosseus muscle also attaches in the same region.
- On the lateral side, the third dorsal interosseus muscle attaches to the bone.
- The oblique head of the adductor hallucis muscle originates from the base of the fourth, as well as the second and third metatarsals.
References
- Metatarsals – Radiopaedia.org
- Metatarsal Bones – Kenhub.com
- Anatomy of the Foot – Arthritis.org
