The submandibular gland lies in the submandibular triangle and fossa of the mandible. It has superficial and deep parts, and its duct passes upwards to open by the frenulum linguae. The hyoglossus muscle originates from the hyoid bone and inserts into the side of the tongue, depressing it. It has superficial relations to the mylohyoid, lingual nerve and submandibular ganglion, and deep relations to the middle constrictor muscle and lingual artery.

2. SUBMANDIBULAR GLAND AND
HYOGLOSSUS MUSCLE AND ITS
RELATIONS

5. 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

6. SUBMANDIBULAR
REGION
 Laterally-Deep cervical fascia and Platysma.
 Medially-Hypoglossus muscle.
 Anteriorly-Sub mental space.
 Posteriorly-Hyoid bone.

7. 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.

9.  Among the three surfaces investing layer of Deep cervical
fascia split intoTwo and covered the inferior and medial
surface.
 Attachment-Lower border of the body of the mandible and to
the Mylohyoid line.

10.  Superficial part:
 Anterior end.
 Posterior end.
 Surfaces-1.Inferior.
2.Lateral.
3.Medial

11.  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.

12.  Lateral surface:
 Submandibular fossa of the mandible.
 Medial pterygoid muscle .
 Facial artery.

13.  Medial surface:
 Extensive-1.Anterior.
2.Posterior.
3.Intermediate.

14.  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,

15.  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.

16.  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.

17.  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.

18.  Blood supply:
 Arterial supply:
Branches of Facial and Lingual arteries(External carotid).
 Venous drainage:
Veins corresponding to the arteries drain into-Internal
jugular vein.

19.  Lymphatic drainage:
 Sub mandibular lymph nodes –Jugulo digastric lymph
nodes.

20.  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.

21.  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.

22.  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.

24. 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

25.  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.

26.  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.