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SUBMANDIBULAR REGION
By
DR. MALA. M
DEPT OF ORAL AND MAXILLOFACIAL SURGERY
INTRODUCTION
The submandibular region contains the
suprahyoid muscles, submandibular and
sublingual salivary glands and submandibular ganglion.
SUPRAHYOID MUSCLES
I. DIGASTRIC
II. STYLOHYOID
III.MYLOHYOID
IV.GENIOHYOID
V. HYOGLOSSUS
anatomy of submandibular region presentation
SUPRAHYOID MUSCLES
anatomy of submandibular region presentation
anatomy of submandibular region presentation
anatomy of submandibular region presentation
Relations of Hyoglossus
Superficial: Styloglossus, lingual nerve,
submandibular
ganglion, deep part of the submandibular
gland, submandibular duct, hypoglossal
nerve
Deep: (a) Inferior longitudinal muscle of
the tongue;
(b) genioglossus (c) middle constrictor of
the pharynx; (d) glossopharyngeal nerve;
(e) stylohyoid
ligament; and (f) lingual artery.
Structures passing deep to posterior
border of
hyoglossus, from the above downwards:
(a) Glossopharyngeal
nerve; (b) stylohyoid ligament; and (c)
lingual artery.
SUBMANDIBULAR SALIVARY GLAND
Introduction :
This is a large salivary gland,
situated
in the anterior part, of the digastric
triangle. The gland is about the size
of a walnut. It is roughly Jshaped,
being indented by the posterior
border of
the mylohyoid which divides it into a
larger part
superficial to the muscle, and a
small part lying
deep to the muscle
Superficial Part
This part of the gland fills the digastric triangle.
It
extends upwards deep to the mandible up to the
mylohyoid line.
It has (a) inferior; (b) lateral; and (c)
medial surfaces.
The gland is partially enclosed between two
layers
of deep cervical fascia. The superficial
layer of fascia covers the inferior surface of the
gland
and is attached to the base of the mandible. The
deep
layer covers the medial surface of the gland and
is
attached to the mylohyoid line of the mandible
Relations
The inferior surface is covered by: (a) Skin;
(b) platysma; (c) cervical branch of the facial
nerve;
(d) deep fascia; (e) facial vein; and (f)
submandibular
lymph nodes The lateral surface is related to: (a)
The submandibular
fossa on the mandible; (b) insertion of
the medial pterygoid; and (c) the facial artery
The medial surface may be divided into three
parts;
(i) The anterior part is related to the mylohyoid
muscle, nerve and vessels.
(ii) The middle part is related to the hyoglossus,
the styloglossus, the lingual nerve the
submandibular
ganglion and the hypoglossal nerve
(iii) The posterior part is related to the
styloglossus,
the stylohyoid ligament, the ninth nerve, and the
Deep Part
This part is small in size. It
lies deep to the mylohyoid,
and superficial to the
hyoglossus and the
styloglossus.
Posteriorly, it is continuous
with the superficial part
round the posterior border of
the mylohyoid.
Anteriorly, it extends up to
the posterior end of the
sublingual gland
Submandibular
Duct
It is thin walled, and is
about 5 cm long. It
emerges at
the anterior end of the
deep part of the gland and
runs
forwards on the
hyoglossus, between the
lingual and
hypoglossal nerves. At
the anterior border of the
hyoglossus the duct is
crossed by the lingual
nerve. It opens on the
floor of the mouth, on the
summit of the sublingual
papilla, at the side of the
Blood Supply and Lymphatic Drainage
It is supplied by the facial artery. The veins drain into
the common facial or lingual vein. Lymph passes to
submandibular lymph nodes.
Nerve Supply
It is supplied by branches from the submandibular
ganglion. These branches convey: (a) Secretomotor
fibres; (b) sensory fibres from the lingual nerve, and
(c) vasomotor sympathetic fibres from the plexus on
the facial artery.
Secretomotor pathway
SUBMANDIBULAR GANGLION
This is a parasympathetic peripheral
ganglion. It is
a relay station for secretomotor fibres to
the
submandibular and sublingual salivary
glands.
Topographically, it is related to the lingual
nerve,
but functionally, it is connected to the
chorda
tympani branch of the facial nerve
(chorda tympani)
The fusiform ganglion lies on the
hyoglossus muscle
just above the deep part of the
submandibular
anatomy of submandibular region presentation
Sublingual salivary gland
This is smallest of the three salivary
glands. It is
almond-shaped and weighs about 3 to 4 g.
It lies
above the mylohyoid, below the mucosa
of the floor
of the mouth, medial to the sublingual
fossa of the
mandible and lateral to the genioglossus.
About 15 ducts emerge from the gland.
Most of
them open directly into the floor of the
mouth on the
summit of the sublingual fold. A few of
them join the
submandibular duct.
The gland receives its blood supply from
the
lingual and submental arteries. The nerve
supply is
similar to that of the submandibular gland.
anatomy of submandibular region presentation
anatomy of submandibular region presentation

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anatomy of submandibular region presentation

  • 1. SUBMANDIBULAR REGION By DR. MALA. M DEPT OF ORAL AND MAXILLOFACIAL SURGERY
  • 2. INTRODUCTION The submandibular region contains the suprahyoid muscles, submandibular and sublingual salivary glands and submandibular ganglion.
  • 3. SUPRAHYOID MUSCLES I. DIGASTRIC II. STYLOHYOID III.MYLOHYOID IV.GENIOHYOID V. HYOGLOSSUS
  • 9. Relations of Hyoglossus Superficial: Styloglossus, lingual nerve, submandibular ganglion, deep part of the submandibular gland, submandibular duct, hypoglossal nerve Deep: (a) Inferior longitudinal muscle of the tongue; (b) genioglossus (c) middle constrictor of the pharynx; (d) glossopharyngeal nerve; (e) stylohyoid ligament; and (f) lingual artery. Structures passing deep to posterior border of hyoglossus, from the above downwards: (a) Glossopharyngeal nerve; (b) stylohyoid ligament; and (c) lingual artery.
  • 10. SUBMANDIBULAR SALIVARY GLAND Introduction : This is a large salivary gland, situated in the anterior part, of the digastric triangle. The gland is about the size of a walnut. It is roughly Jshaped, being indented by the posterior border of the mylohyoid which divides it into a larger part superficial to the muscle, and a small part lying deep to the muscle
  • 11. Superficial Part This part of the gland fills the digastric triangle. It extends upwards deep to the mandible up to the mylohyoid line. It has (a) inferior; (b) lateral; and (c) medial surfaces. The gland is partially enclosed between two layers of deep cervical fascia. The superficial layer of fascia covers the inferior surface of the gland and is attached to the base of the mandible. The deep layer covers the medial surface of the gland and is attached to the mylohyoid line of the mandible
  • 12. Relations The inferior surface is covered by: (a) Skin; (b) platysma; (c) cervical branch of the facial nerve; (d) deep fascia; (e) facial vein; and (f) submandibular lymph nodes The lateral surface is related to: (a) The submandibular fossa on the mandible; (b) insertion of the medial pterygoid; and (c) the facial artery The medial surface may be divided into three parts; (i) The anterior part is related to the mylohyoid muscle, nerve and vessels. (ii) The middle part is related to the hyoglossus, the styloglossus, the lingual nerve the submandibular ganglion and the hypoglossal nerve (iii) The posterior part is related to the styloglossus, the stylohyoid ligament, the ninth nerve, and the
  • 13. Deep Part This part is small in size. It lies deep to the mylohyoid, and superficial to the hyoglossus and the styloglossus. Posteriorly, it is continuous with the superficial part round the posterior border of the mylohyoid. Anteriorly, it extends up to the posterior end of the sublingual gland
  • 14. Submandibular Duct It is thin walled, and is about 5 cm long. It emerges at the anterior end of the deep part of the gland and runs forwards on the hyoglossus, between the lingual and hypoglossal nerves. At the anterior border of the hyoglossus the duct is crossed by the lingual nerve. It opens on the floor of the mouth, on the summit of the sublingual papilla, at the side of the
  • 15. Blood Supply and Lymphatic Drainage It is supplied by the facial artery. The veins drain into the common facial or lingual vein. Lymph passes to submandibular lymph nodes. Nerve Supply It is supplied by branches from the submandibular ganglion. These branches convey: (a) Secretomotor fibres; (b) sensory fibres from the lingual nerve, and (c) vasomotor sympathetic fibres from the plexus on the facial artery.
  • 17. SUBMANDIBULAR GANGLION This is a parasympathetic peripheral ganglion. It is a relay station for secretomotor fibres to the submandibular and sublingual salivary glands. Topographically, it is related to the lingual nerve, but functionally, it is connected to the chorda tympani branch of the facial nerve (chorda tympani) The fusiform ganglion lies on the hyoglossus muscle just above the deep part of the submandibular
  • 19. Sublingual salivary gland This is smallest of the three salivary glands. It is almond-shaped and weighs about 3 to 4 g. It lies above the mylohyoid, below the mucosa of the floor of the mouth, medial to the sublingual fossa of the mandible and lateral to the genioglossus. About 15 ducts emerge from the gland. Most of them open directly into the floor of the mouth on the summit of the sublingual fold. A few of them join the submandibular duct. The gland receives its blood supply from the lingual and submental arteries. The nerve supply is similar to that of the submandibular gland.

Editor's Notes

  1. Relations of Posterior Belly of Digastric Superficial: (a) Mastoid process with the sternocleidomastoid, the splenius capitis and the longissimus capitis; (b) the stylohyoid; (c) the parotid gland with retromandibular vein; (d) submandibular salivary gland and lymph nodes; (e) angle of the mandible with the medial pterygoid Deep: (a) Transverse process of the atlas with superior oblique and the rectus capitis lateralis; (b) internal carotid, external carotid, lingual, facial and occipital arteries; (c) internal jugular vein; (d) vagus, accessory and hypoglossal cranial nerves; and (e) the hyoglossus muscle. Its upper border is related to: (a) The posterior auricular artery and (b) the stylohyoid muscle. Its lower border is related to the occipital artery
  2. Superficial: (a) Anterior belly of the digastric; (b) superficial part of the submandibular salivary gland; (c) mylohyoid nerve and vessels; and (d) submental branch of the facial artery Deep: (a) Hyoglossus with its superficial relations, namely the styloglossus, the lingual nerve, the submandibular ganglion, the deep part of the submandibular salivary gland, the submandibular duct, the hypoglossal nerve. hypoglossi; and (b) the genioglossus with its superficial relations, namely the sublingual salivary gland, the lingual nerve, submandibular duct, the lingual artery, and the hypoglossal nerve