SUBMANDIBULAR GLAND AND

HYOGLOSSUS MUSCLE AND ITS

RELATIONS

SUBMANDIBULAR

REGION

The area between the body of the mandible and Hyoid bone.

Boundaries:

Superiorly-Myalohyoid muscle and inferior border of the Mandible.

Inferiorly-anterior and posterior belly of Digastric

SUBMANDIBULAR

REGION

Laterally-Deep cervical fascia and Platysma.

Medially-Hypoglossus muscle.

Anteriorly-Sub mental space.

Posteriorly-Hyoid bone.

SUBMANDIBULAR GLAND

Lies in the Digastric triangle

and lies partly in the

Submandibular fossa of the

Mandible.

•Large superficial and Deep

part s.

•Continued around the

Posterior border of

Mylohyoid muscle.

Among the three surfaces investing layer of Deep cervical fascia split into Two and covered the inferior and medial surface.

Attachment-Lower border of the body of the mandible and to the Mylohyoid line.

Superficial part:

Anterior end.

Posterior end.

Surfaces-1.Inferior.

2.Lateral.

3.Medial

Inferior surface:

Covered by skin, superficial fascia platysma and deep

cervical fascia.

Crossed by common facial vein,cervical branch of Facial

nerve and submandibular lymph nodes.

Lateral surface:

Submandibular fossa of the mandible.

Medial pterygoid muscle .

Facial artery.

Medial surface:

Extensive-1.Anterior.

2.Posterior.

3.Intermediate.

Anterior part:

Rests on the Mylohyoid muscle separated by mylohyoid nerves and vessels and submental branch of facial artery.

Postreior part:

Related to styloglossus ,stylopharyngeus and glossopharyngeal nerve.

Posterior belly of digastric and middle constrictor of pharynx.

Hypoglossal nerve and first part of Lingual artery.

Intermediate part:

Rests on the Hyoglossus muscle, Lingual nerve and submandibular ganglion ,Hypoglossal nerve and a pair of veins , intermediate tendon of digastric,

Deep part:

Extension:

Forward in the interval between the mylohyoid and hyoglossus up to the posterior end of the sublingual gland.

Relations:

Laterally-mylohyoid

Medially-hyoglossus

Above-lingual nerve and submandibular ganglion.

Below-hypoglossal nerve accompanied by a pair of veins.

Submandibular duct:

5cm long ,

Begins from the middle of the deep surface of the superficial part of the gland.

course:

Passes upwards and backwards for about 5mm

Forwards and upwards through the deep part of the gland and finally opens in the floor of the mouth on a sublingual papilla on each side of the Frenulum linguae.

The duct presents an intimate relation with the Lingual

nerve.

At first the Nerve lies above,

Crosses its lateral side,

and finally ascends medially winding round the lower

border of the duct.

Blood supply:

Arterial supply:

Branches of Facial and Lingual arteries(External carotid).

Venous drainage:

Veins corresponding to the arteries drain into-Internal

jugular vein.

Lymphatic drainage:

Sub mandibular lymph nodes –Jugulo digastric lymph

nodes.

Supplied by both parasympathetic and sympathetic nerves.

Preganglionic para sympathetic fibres arises from Superior salivatory nucleus in the pons.

Pass successiively through facial-chordatympani-Lingual nerve and terminate –Submandibular ganglion(acts as a relay station).

Post ganglionic fibres from the ganglion supply directly the submandibular gland.

Hyoglossus muscle and its relations:

Origin-upper surface of the greater cornu and partly from

the body of the hyoid bone.

Insertion-Into the side of the tongue .

Action-Depresses the side of the tongue and make dorsal

surface convex.

Superficial relation:

Mylohyoid muscle-antero posteriorly.

Mucous membrane of the side of the tongue.

Styloglossus.

Lingual nerve.

Submandibular ganglion.

Deep part of submandibular gland and its duct.

Hypoglossal nerve and its venae commitans.

DEEP RELATIONS OF HYOGLOSSUS (Myelohyoid & digastric muscles are removed)

Geniohyoid

Genioglossus

Lingual artery

External carotid artery

Lingual nerve

Styloglossus

Stylopharyngeus

Glossopharyngeal nerve

Hypoglossal nerve

Submandibular ganglion

Submandibular duct

Hyoglossus

Stylohyoid ligament

Sublingual gland

Deep relations of hyoglossus:

Middle constrictor muscle.

Second part of Lingual artery .

Longitudenalis linguae.

Genioglossus and third part of Lingual artery.

Stylo pharyngeus,

Glosso pharyngeal nerve.

Stylo hyoid ligament.

Essay:

Describe sub mandibular gland under a.parts

and its relations

b.sub mandibular duct.

c.blood supply and lymphatic drainage.

d.nerve supply .

SQ.

Hyoglossus muscle and its relations.