This document describes the anatomy of several muscles and structures in the submandibular region. It includes descriptions and images of the digastric muscle, myelohyoid muscle, hyoglossus muscle, geniohyoid muscle, genioglossus muscle, stylohyoid muscle, submandibular gland, sublingual gland, and the submandibular ganglion. Relations and functions of each structure are provided, with an emphasis on their location and connections to surrounding muscles and nerves in the neck.

1. SUBMANDIBULAR
REGION
(Page 70)
Dr.Sherif Fahmy

2. Sterno-
mastoid m.
Superior belly
of omohyoid
m.
Digastric m.
Lower
border of
body of
mandible
Midline of
neck

3. Muscles of Submandibular
(Suprahyoid) Region
1- Digastric muscle.
2- Stylohyoid muscle.
3- Myelohyoid muscle.
4- Hyoglossus muscle.
5- Geniohyoid muscle.
6- Genioglossus muscle.

4. Superficial part of
submandibular
gland
Anterior belly of
digastric m.
Dr. Sherif Fahmy
Posterior belly of digastric m.

5. Anterior belly of
digastric m.
Myelohyoid
nerveSubmental
artery
Myelohyoid m.
Dr. Sherif Fahmy
Posterior belly of
digastric m.
Stylohyoid m.
Hyoglossus m.
Dr.Sherif Fahmy

6. Myelohyoid m.
Lingual n.
Submandibular
ganglion
Deep part of
submandibular
gland Hypoglossal
nerve
Posterior belly
of digastric m.
Submandibular
duct
Dr. Sherif Fahmy
Myelohyoid n
Submental vs
Anterior belly
of digastric m
Hyoglossus m.

7. Geniohyoid
m.
Hyoglossus m.
Genio-glossus m.
Stylo-glossus m.
Lingual nerve
Hypoglossal nerve
Deep part of submandibular
gland
Submandibular duct
Myelohyoid m. (cut)
Dr. Sherif Fahmy

8. Styloid process
Stylohyoid ligamnent
Glossopharyngeal n.
Middle
constrictor m.
First part of
lingual artery
3rd
part of
lingual artery
Geniohyoid
m.
Genioglossus m.
Sublingual gl.
Dr. Sherif Fahmy

10. Digastric Muscle
(Page 70)
Dr.Sherif Fahmy

11. Mastoid
process
Styloid
process
Posterior belly
of digastric m.
Stylohyoid m.
Anterior belly of
digastric m.Hyoid bone
Fibrous
loop
Digastric
fossa
Mandible
Intermediet tendon

12. Relations of
Digastric Muscle
Dr.Sherif Fahmy

13. A- Anterior Belly
Dr.Sherif Fahmy

14. Superficial part of
submandibular
gland
Anterior belly of
digastric m.
Superficial Relations of Anterior belly Digastric muscle
Dr. Sherif Fahmy
Dr.Sherif Fahmy

15. Anterior belly of
digastric m.
Myelohyoid
nerveSubmental
artery
Myelohyoid m.
Deep Relations of Anterior belly Digastric Muscle
Dr. Sherif FahmyDr.Sherif Fahmy

16. B- Posterior Belly
Dr.Sherif Fahmy

17. Superficial part of
submandibular
gland
Posterior belly
of digastric m.
Parotid gland
Superficial Relations of Posterior Belly Digastric muscle
Mastoid process
Angle of mandible
Dr. Sherif Fahmy
Dr.Sherif Fahmy

18. Posterior belly of digastric
m.
Internal carotid
art.
External
carotid art.
Facial art.
Occipita
l art.
I.J.V.
Hypoglossal n.
Vagus n.
Spinal accessory n.
Deep relations of posterior belly of
digastric m.
Dr. Sherif Fahmy
Dr.Sherif Fahmy

19. Relations to Borders of
Posterior Belly of
Digastric m.
Dr.Sherif Fahmy

20. Stylohyoid m
Dr. Sherif FahmyDr.Sherif Fahmy

21. Posterior belly of digastric
m.
Posterior auricular art.
Occipital art.
Dr.Sherif Fahmy

22. Myelohyoid Muscle
(Diaphragma Oris)
(Page 74)
Dr.Sherif Fahmy

23. Myelohyoid
muscle
Myelohyoid
line
Median raphe
Body of hyoid
bone
Dr. Sherif Fahmy

24. Relations of
Myelohyoid M.
Dr.Sherif Fahmy

25. Anterior belly of
digastric m.
Myelohyoid
m.
myelohyoid
nerve
Submental
artery
Beginning of
anterior jugular vein
Superficial Submental lymph nodes
Dr. Sherif FahmyDr.Sherif Fahmy

26. Superficial part of
submandibular
gland
Dr. Sherif Fahmy

27. Geniohyoid
m.
Hyoglossus m.
Genio-glossus m.
Stylo-glossus m.
Lingual nerve
Hypoglossal nerve
Deep part of submandibular
gland
Submandibular duct
Myelohyoid m. (cut)
Deep
Dr. Sherif Fahmy

28. Submental Triangle
(Page 40)
Dr.Sherif Fahmy

29. Anterior belly of
digastric m.
Myelohyoid
m.
Submental
artery
Beginning of
anterior jugular vein
Body of hyoid bone
Submental
lymph nodes
Dr. Sherif Fahmy

30. Hyoglossus Muscle
(Page 78)
Dr.Sherif Fahmy

31. Greater horn of hyoid m.
tongue
Hyoglossus m.
Dr. Sherif Fahmy

32. Relations of
Hyoglossus M.
Dr.Sherif Fahmy

33. Myelohyoid m.
Lingual n.
Submandibular
ganglion
Deep part of
submandibular
gland Hypoglossal
nerve
Posterior belly
of digastric m.
Superficial Relations
of Hyoglossus Muscle
Submandibular
duct
Dr. Sherif Fahmy

34. Styloid process
Styloglossus m.
Lingual nerve
Submandibular ganglion
Deep part of
submandibular gland
Hypoglossal n.
Dr. Sherif Fahmy

35. Styloid process
Stylohyoid ligamnent
Glossopharyngeal n.
Middle
constrictor m.
First part of
lingual artery
3rd
part of
lingual artery
Geniohyoid
m.
Genioglossus m.
Deep, anterior and posterior
relations
Sublingual gl.
Dr. Sherif Fahmy

36. Stylohyoid Muscle
(Page 76)
Dr.Sherif Fahmy

37. Dr. Sherif Fahmy

38. Geniohyoid Muscle
(Page 70)
Dr.Sherif Fahmy

39. Geniohyoid m.
Genial
tubercles
Body of hyoid bone
Dr. Sherif Fahmy

40. Genioglossus Muscle
(Page 78)
Dr.Sherif Fahmy

41. Hypoglossal nerve
Genioglossus m.
Dr. Sherif Fahmy

42. Submandibular
Salivary Gland
Page 82
Dr.Sherif Fahmy

43. Parts, site and extensions
• Parts: superficial & deep to myelohyoid
muscle.
• Site: Upper part is deep to mandible
(submandibular fossa) while the lower part in
digastric triangle.
• Extensions:
Anterior: mental foramen.
Posterior: Angle of mandible.
Superior: myelohyoid line.
Inferior: intermediate tendon of digastric muscle.
Dr.Sherif Fahmy

44. Superficial part of
submandibular
gland
Posterior belly
of digastric m.
Anterior belly of
digastric m.
Parotid gland
Dr. Sherif Fahmy

45. Relations of the
superficial part
Dr.Sherif Fahmy

46. Lateral surface
Inferolateral
surface
Medial
pterygoid m.
Facial artery
Facial vein
Cervical
branch of
facial nerve
Submandibular
lymph nodes
Body of
mandible
Lateral &
inferolateral relations
Dr. Sherif Fahmy

47. Myelohyoid m.
Lingual n.
Submandibular
ganglion
Deep part of
submandibular gland
Hypoglossal n.
Posterior
belly of
digastric m. Dr. Sherif Fahmy

48. Relations of deep
part and course of
the duct
Dr.Sherif Fahmy

49. Hyoglossus m.
Myelohyoid m.
Lingual n.
Hypoglossal n.
Submandibular duct
Deep part of submandibular
gland
Styloglossus
m.
Sublingual gland
Dr. Sherif Fahmy

50. Frenulum
of tongue
Sublingual fold
Opening of submandibular
duct
Dr.Sherif Fahmy

51. Nerve supply:
1- Sensory
2- Sympathetic.
3- Parasympathetic.
Blood supply.
By facial vessels.
Dr.Sherif Fahmy

52. Myelohyoid m.
Lingual n.
Submandibular ganglion
Dr. Sherif Fahmy

53. Applied Anatomy
• Formation of a stone in its duct is
common because its secretion is
muco-serous and more viscid.
• In this case the gland swell during
chewing.
Dr.Sherif Fahmy

54. DIGASTRIC TRIANGLE
(Page 36)
Dr.Sherif Fahmy

55. Boundaries
Dr.Sherif Fahmy

56. Digastric m.
Lower
border of
body of
mandible
Dr. Sherif Fahmy

57. Posterior belly
of digastric m.
Stylohyoid m.
Anterior belly of
digastric m.
Mandible
Dr. Sherif Fahmy

58. Floor of Digastric
Triangle
Dr.Sherif Fahmy

59. Myelohyoid m.
Hyoglossus m.
Dr. Sherif Fahmy

60. Contents
Dr.Sherif Fahmy

61. Lateral surface
Inferolateral
surface
Medial
pterygoid m.
Facial artery
Facial vein
Cervical
branch of
facial nerve
Submandibular
lymph nodes
Body of
mandible
Lateral &
inferolateral relations
Dr. Sherif Fahmy

62. Myelohyoid m.
Lingual n.
Submandibular
ganglion
Deep part of
submandibular gland
Hypoglossal n.
Posterior
belly of
digastric m.
Dr. Sherif Fahmy

63. Sublingual Salivary Gland
Dr.Sherif Fahmy

64. Sublingual
salivary gland
Submandibular
salivary gland
Parotid gland
Dr.Sherif Fahmy

65. Myelohyoid m.
Lingual n.
Submandibular duct
Deep part of submandibular
gland
Sublingual gland
Dr. Sherif Fahmy

66. Dr. Sherif Fahmy

67. Submandibular
Ganglion
(Page 88)
Dr.Sherif Fahmy

68. Dr.Sherif Fahmy