Musculus digastricus
Imaging of
the sublingual and submandibular spaces. Anatomy of the submandibular and sublingual spaces in the coronal plane: picture illustration and T2-weighted MR image
The digastric muscle is composed of two bellies, anterior and posterior, connected by an intermediate round tendon. The two bellies of the muscle have different embryonic origins and hence are supplied by different cranial nerves.
Summary
- origin
- anterior belly: digastric fossa on the deep surface of symphysis menti of the mandible
- posterior belly: mastoid process of temporal bone
- insertion: hyoid bone via intermediate tendon (see deep cervical fascia)
- arterial supply
- anterior belly: submental branch of the facial artery
- posterior belly: occipital artery
- nerve supply
- anterior belly: mylohyoid nerve, a branch of the posterior division of the mandibular division of the trigeminal nerve (CN V)
- posterior belly: unnamed branch of the facial nerve (CN VII) which arises between the stylomastoid foramen and the parotid gland
- actions: opens the jaw when masseter and temporalis are relaxed
Siehe auch:
- mandible
- Nervus trigeminus
- Nervus facialis
- Hirnnerven
- Mundbodenmuskulatur
- Arteria occipitalis
- Arteria facialis
und weiter:
Assoziationen und Differentialdiagnosen zu Musculus digastricus:
