Salivary Glands & Submandibular Region Flashcards
where is submandibular gland in respect to mylohyoid
partly superficial and partly deep to mylohyoid i.e. wraps around the muscle
submandibular secretions
mixed serous and mucous secretions
arterial supply of submandibular glands
submental arteries
venous drainage of submandibular glands
submental veins
lymphatic vessels of submandibular gland
end in deep cervical lymph nodes esp the jugulo-omohyoid node
submandibular gland fascial capsule is
continuous with deep investing cervical fascia
where do submandibular ducts open in the oral cavity
into 3 orifices beside the base of the frenulum called sublingual caruncles
secretions of sublingual gland
mostly mucous with some serous
location of sublingual gland
floor of mouth between mandible and hyoglossus, lateral to submandibular duct and lingual nerve
arterial supply of sublingual glands
sublingual and submental arteries, branches of the lingual and facial arteries respectively
what lays over sublingual glands
sublingual folds that extend to the frenulum of the tongue
drainage of sublingual glands
ducts drain via openings into crest of sublingual fold but can sometimes empty with submandibular gland
aim of parasympathetic innervation
to produce saliva
parasympathetic preganglionic path
travel to submandibular ganglion from chorda tympani (CN VII nervus intermedius) & via lingual nerve (CN V3)
parasympathetic postganglionic path
travel in lingual nerve to sublingual gland OR travel directly to sublingual & submandibular glands not in a nerve
name 4 minor salivary glands in submucosa of oral cavity
- buccal
- palatine
- lingual
- labial
innervation of minor salivary glands
CN VII // CN V
minor salivary glands are susceptible to
mucoceles i.e. swelling due to blockage of associated ducts
glands above level of oral fissure are innervated by
greater petrosal nerve of CN VII
glands below level of oral fissure are innervated by
chorda tympani of CN VII
3 main pathologies of salivary glands / ducts
- mumps
- salivary stones / calculi (sialothiasis)
- excessive salivation - ptyalism
salivary stones most common in which duct
submandibular duct due to upwards course into oral cavity
suprahyoid muscles connect to
skull or mandible
name the 4 suprahyoid muscles
- mylohyoid
- digastric
- stylohyoid
- geniohyoid
infrahyoid muscles connect to
inferior structures i.e. sternum, scapula, thyroid cartilage
name the 4 infrahyoid muscles
- sternothyroid
- sternohyoid
- thyrohyoid
- omohyoid
origin and insertion of mylohyoid
origin - mylohyoid line on mandible
insertion - body of hyoid
action of mylohyoid
elevates hyoid and floor of mouth
innervation of mylohyoid
CN V3 via inferior alveolar branch the nerve to mylohyoid
origin of anterior & posterior belly of digastric
anterior belly - digastric fossa on lower medial aspect of mandible
posterior belly - mastoid notch on medial side of mastoid process
insertion of anterior & posterior belly of digastric
both insert at attachment of their intermediate tendon at hyoid bone
anterior belly of digastric function
elevates hyoid & opens mouth by lowering mandible
posterior belly of digastric function
elevates & retracts hyoid bone
innervation of digastric
anterior belly - nerve to mylohyoid CN V3
posterior belly - digastric branch of CN VII
