Examples of interossei

• It acts principally on the proximal phalanges, the middle and terminal phalanges being extended mainly by the interossei and lumbricales.

• Additionally, the interossei act as plantar flexors at the metatarsophalangeal joints.

• The considerably smaller flexor digiti minimi brevis on the lateral side can be mistaken for one of the interossei.

• This occurs because the ulnar nerve also innervates the palmar and dorsal interossei of the hand.

• The lateral part of the first dorsal interossei muscle originates from the medial side of the bone.

• Flexion is primarily performed by intrinsic foot muscles; the second toe (the) is unique as it has two dorsal interossei but no plantar interossei muscles.

• The third dorsal interossei from the medial side of the bone and the fourth dorsal interossei from the lateral side.

• The second dorsal interossei from the medial side of the bone and the third dorsal interossei from the lateral side.

• The two heads of the four dorsal interossei arise on two adjacent metatarsals and merge in the intermediary spaces.

• Between the toes, the dorsal and plantar interossei stretch from the metatarsals to the proximal phalanges of digits two to five.

• Abduction is of little importance in the foot, but, together with the plantar interossei, the dorsal interossei also produce flexion at the metatarsophalangeal joints.

• There are many interossei in a human body.

• In other mammals, the contrahentes may have their origin either on the carpus or the metacarpus, which suggests that the palmar interossei muscles also contain elements of the contrahentes.

• They also provide motor innervation to quadratus plantae, abductor digiti minimi, flexor digiti minimi brevis, lateral three lumbricals, adductor hallucis, and the dorsal and plantar interossei.

• The three plantar interossei arise with their single heads on the medial side of the third-fifth metatarsals and are inserted on the bases of the first phalanges of these digits.