Neck anatomy - Anterior triangle - MRCS

MRCS Neck anatomy - Anterior triangle
Submandibular region
• The region immediately below the mandible.
Boundaries Anterior triangle
Superior Body of mandible
Anterior Anterior belly of digastric
Posterior Posterior belly of digastric
Roof Skin, superficial fascia, platysma, deep fascia
Floor Mylohyoid muscle
Superficial submandibular structures:
Platysma - broad sheet of superficial muscle arising from
the fascia that overlaps sternocleidomastoid.
Facial vein
Cervical branch of facial nerve - supplies platysma
Submandibular gland:
• Accounts for ≈ 70% of salivary production
• Wharton’s duct (submandibular duct) arises from the
gland and passes between mylohyoid, hyoglossus and
genioglossus - eventually opening either the side of the
lingula frenulum.
• Parasympathetic supply - from a branch of the facial
nerve the chorda tympani (CNVII) which runs in the
sheath of the lingual nerve (branch of mandibular nerve
CNV3) to synapse at the submandibular ganglion -
which supplies the submandibular gland and lies on
hyoglossus.
Deep submandibular structures:
Facial artery
Lingual nerve -branch of mandibular nerve (CNV3)
Submandibular ganglion
Hypoglossal nerve (CNXII) - supplies all muscles of
tongue except palatoglossus.
Lingual artery