1. ORAL CAVITY-1
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2. Objectives
Recognise and describe a section of the lip, identifying the main features and constituent tissues.
Recognise and describe a section of the palate, distinguishing between hard and soft palate and identifying its epithelia and glands.
Recognise and describe a section of tongue (low power) appreciating the arrangement of epithelium, connective tissue (with fat cells), blood vessels, nerves, glands and muscle.
Recognise and describe the main lingual papillae (high power).
To be able to distinguish and describe serous and mucous lingual glands.

3. SLIDE 1 Lip (cat) At low magnification identify:
oral surface aboral surface labial margin
1.0 mm

4. SLIDE 1 Lip (cat) What type of epithelium covers :
1. the oral surface?
2. the aboral surface?
oral surface
labial margin
1.0 mm
aboral surface

5. SLIDE 1 Lip (cat) What type of epithelium covers :
1. the oral surface? stratified squamous (little keratinisation)
2. the aboral surface?
oral surface
labial margin
1.0 mm
aboral surface

6. SLIDE 1 Lip (cat) What type of epithelium covers :
1. the oral surface? stratified squamous (little keratinisation)
2. the aboral surface? keratinised stratified squamous
oral surface
labial margin
1.0 mm
aboral surface

7. SLIDE 1 Lip (cat) At low magnification identify;
on the aboral surface:
hair follicles of two types; what are they?
1.0 mm

8. SLIDE 1 Lip (cat) At low magnification identify;
on the aboral surface:
hair follicles of two types; what are they?
Sinus hair follicles and compound hair follicles.
sinus hair follicles
1.0 mm
compound hairs

9. Identify: two types of gland. What are they?
SLIDE Lip (cat)
Identify: two types of gland.
What are they?
100 µm
1.0 mm

10. SLIDE 1 Lip (cat) B Identify: two types of gland. What are they?
A : sebaceous glands.
B : apocrine sweat glands. A
100 µm B A
1.0 mm

11. What cranial nerve might be seen in this section?
SLIDE Lip (cat)
What cranial nerve might be seen in this section?
1.0 mm

12. SLIDE 1 Lip (cat) What cranial nerve might be seen in this section?
The facial or seventh cranial nerve.
150 µm
1.0 mm

13. What skeletal muscle is probably within this section?
SLIDE Lip (cat)
What skeletal muscle is probably within this section?
1.0 mm

14. SLIDE Lip (cat)
What skeletal muscle is probably within this section?
The orbicularis oris muscle.
muscle
connective tissue
1.0 mm

15. How are these muscle fibres orientated re. the plane of the section?
SLIDE Lip (cat)
How are these muscle fibres orientated re. the plane of the section?
50 µm
1.0 mm

16. SLIDE Lip (cat)
How are these muscle fibres orientated re. the plane of the section?
In transverse section.
50 µm
1.0 mm

17. What is this muscle’s function?
SLIDE Lip (cat)
What is this muscle’s function?
50 µm
1.0 mm

18. What is this muscle’s function? It closes the lips.
SLIDE Lip (cat)
What is this muscle’s function?
It closes the lips.
50 µm
1.0 mm

19. SLIDE Palate (mouse)
This is a sagittal section through the head of a very young mouse.
Identify: brain in cranium nasal cavity ethmoid bone (cribriform plate)
hard palate soft palate skin
nasopharynx palatine bone
1.0 mm

20. SLIDE Palate (mouse)
This is a sagittal section through the head of a very young mouse.
Identify: brain in cranium nasal cavity ethmoid bone (cribriform plate)
hard palate soft palate skin
nasopharynx palatine bone
ethmoid bone
nasal turbinates
skin
brain
nasal cavity
palatine bone
hard palate
nasopharynx
1.0 mm
soft palate

21. SLIDE Palate (mouse)
Another section through the head. In this section only the hard palate is present.
Identify: nasal cavity ethmoid bone (cribriform plate)
hard palate skin
palatine bone incisor
1.0 mm

22. SLIDE Palate (mouse)
Another section through the head. In this section only the hard palate is present.
Identify: nasal cavity ethmoid bone (cribriform plate)
hard palate skin
palatine bone incisor
ethmoid bone
nasal turbinates
nasal cavity
skin
with hairs
nasal opening
palatine bone
incisor tooth
hard palate
1.0 mm

23. Sagittal section of horse head.
With reference to the dissection class : locate the areas of hard and soft palate.

24. What type of epithelium covers the hard palate?
SLIDE Palate (mouse)
What type of epithelium covers the hard palate?
Oral Cavity _ Dog
▪ Tongue & larynx have been removed
▪ Soft palate has been incised along the palatoglossal
arches
▪ Note partially pigmented mucosa of upper lip
▪ Note ridged, pigmented mucosa of hard palate
▪ Identify : soft palate, junction of hard and soft palates
250 µm

25. SLIDE 2 Palate (mouse) What type of epithelium covers the hard palate?
Keratinised stratified squamous epithelium.
Stratum :
1: basale
2: spinosum
3: granulosum
4: lucidum
(unclear)
5: corneum
keratinised 1 2 3 5 4
100 µm

26. What type of epithelium covers the oral surface of the soft palate?
SLIDE Palate (mouse)
What type of epithelium covers the oral surface of the soft palate?
nasopharynx
oral cavity
250 µm

27. SLIDE Palate (mouse)
What type of epithelium covers the oral surface of the soft palate?
Stratified squamous epithelium.
stratified squamous
epithelium, some
keratinisation
oral cavity
50 µm

28. SLIDE 2 Palate (mouse) Junction between soft and hard palate.
What glands are present in the soft palate?
250 µm
50 µm

29. SLIDE 2 Palate (mouse) Junction between soft and hard palate.
What glands are present in the soft palate?
Palatine glands (minor salivary gland).
250 µm
palatine glands
50 µm

30. SLIDE Palate (mouse)
What type of epithelium covers the aboral surface of the soft palate seen here?
aboral surface
25 µm

31. SLIDE Palate (mouse)
What type of epithelium covers the aboral surface of the soft palate seen here?
Ciliated, pseudostratified columnar epithelium.
ciliated,
pseudostratified,
columnar epithelium
aboral surface
25 µm

32. SLIDE Palate (mouse)
What type of epithelium covers the aboral surface of the soft palate seen here?
Ciliated, pseudostratified columnar epithelium.
What striated muscle might be sectioned in the soft palate?
ciliated,
pseudostratified,
columnar epithelium
aboral surface
25 µm

33. SLIDE Palate (mouse)
What type of epithelium covers the aboral surface of the soft palate seen here?
Ciliated, pseudostratified columnar epithelium.
What striated muscle might be sectioned in the soft palate?
Palatine muscle.
ciliated,
pseudostratified,
columnar epithelium
aboral surface
striated muscle
palatine gland
25 µm

34. SLIDE Demo TS Head SECTION THROUGH ORAL AND NASAL CAVITIES
Embryonic
Identify:
1. Oral cavity.
2. Nasal cavity.
3. Nasal septum.
4. Nasal conchae.
5. Tongue.
6. Mandible.
7. Developing molars.
1.0 mm

35. SLIDE Demo TS Head SECTION THROUGH ORAL AND NASAL CAVITIES
Embryonic 2 2 4
Identify:
1. Oral cavity.
2. Nasal cavity.
3. Nasal septum.
4. Nasal conchae.
5. Tongue.
6. Mandible.
7. Developing molars. 3 1 7 5 6
1.0 mm

36. SLIDE 3 Tongue (cat) Whole section seen at low magnification.
Identify: epithelium fat (adipose) tissue large blood vessels and nerves
glands lingual frenulum
striated muscle- seen in longitudinal, oblique and transverse orientations.
5.0 mm

37. Tongue, larynx & pharynx – dog
▪ Dorsal view
▪ Pharynx and proximal oesophagus have been
opened dorsally.
Window has been cut in trachea.
▪ Identify : papillated (filiform) mucosa of tongue root,
epiglottis, arytenoid cartilages & musculature,
vestibulum oesophagi*, piriform recess*,
limen pharyngoesophageum*, aditus laryngis,
thyrohyoid bones, stylohyoid bones (transected).
* Pars laryngea pharyngis.

38. Oral Cavity - Sheep 2 1 2 1 ▪ Skin reflected from mandible,
partially reflected from maxilla. M.
buccinator removed.
left mandible in situ,
right mandible has been transected just caudal to the
mandibular symphysis; and removed following reflection
of masseter, temporal & pterygoid mm.
(latter apparent dorsal to the tongue)
from the mandibular ramus. 1 2 1
▪ M. buccinator has been transected and reflected to
expose gingival mucosa, buccal mucosa, tongue,
premolar & molar teeth.
▪ Identify papillae of various sorts
of the lingual and buccal mucosa.
▪ Tongue reflected ventrally to show papillated mucosa
(what sort of papillae are apparent?) & torus linguae.
▪ Note :
pigmented, ridged mucosa of hard palate,
non-pigmented soft palate,
mandibular incisor teeth, absence of upper incisors.

39. Whole section seen at low magnification. Identify: epithelium
SLIDE Tongue (cat)
Whole section seen at low magnification.
Identify: epithelium
dorsal
lateral
5.0 mm

40. What type of epithelium covers the tongue?
SLIDE Tongue (cat)
What type of epithelium covers the tongue?
lateral surface
dorsal surface
100 µm

41. SLIDE 3 Tongue (cat) What type of epithelium covers the tongue?
Keratinised stratified squamous epithelium.
lateral surface
dorsal surface
100 µm

42. SLIDE Tongue (cat)
On which surface of the tongue is the epithelium most keratinised and why?
lateral surface
dorsal surface
100 µm

43. SLIDE Tongue (cat)
On which surface of the tongue is the epithelium most keratinised and why?
On the dorsal surface.
There is most contact on this surface.
lateral surface
dorsal surface
100 µm

44. Whole section seen at low magnification. Identify: glands
SLIDE Tongue (cat)
Whole section seen at low magnification.
Identify: glands
5.0 mm

45. Some minor salivary glands (lingual) can be seen in this section.
SLIDE Tongue (cat)
Some minor salivary glands (lingual) can be seen in this section.
salivary gland
0.5 mm

46. Minor salivary glands in body of the tongue. See also slide 4.
SLIDE Tongue (cat)
Minor salivary glands in body of the tongue.
See also slide 4.
duct
acini
50 µm

47. SLIDE 3 Tongue (cat) Whole section seen at low magnification.
Identify: fat (adipose) tissue
striated muscle- seen in longitudinal, oblique and transverse orientations.
lingual frenulum
frenulum
5.0 mm

48. SLIDE Tongue (cat)
At fairly low magnification, the bundles of striated fibres forming the intrinsic muscles of the tongue can be seen cut in many orientations.
250 µm

49. SLIDE Tongue (cat)
Here at medium magnification striated muscle fibres can be seen cut in transverse and longitudinal section.
Note the large areas of unilocular adipocytes (white fat).
adipocytes B
striated muscle
A : TS section
B : LS section A
100 µm

50. SLIDE 3 Tongue (cat) Whole section seen at low magnification.
Identify: large blood vessels and nerves.
5.0 mm

51. SLIDE Tongue (cat)
Deep in the body of the tongue can be seen many blood vessels and nerves.
Which cranial nerve innervates the intrinsic and extrinsic muscles of the tongue?
N : nerves
A : arteries
V : veins N A A N V
250 µm

52. SLIDE Tongue (cat)
Deep in the body of the tongue can be seen many blood vessels and nerves.
Which cranial nerve innervates the intrinsic and extrinsic muscles of the tongue?
The hypoglossal or twelfth cranial nerve.
N : nerves
A : arteries
V : veins N A A N V
250 µm

53. DEMO SLIDE (8) Tongue injected cat
This section of tongue has been injected with a blue dye to show the blood vessels.
5.0 mm

54. SLIDE 4 Lingual glands (mouse)
Two types of salivary gland can be seen in this section.
dorsal surface
body of tongue
root of tongue
1.0 mm

55. SLIDE 4 Lingual glands (mouse)
In the body of the tongue.
Within the musculature of the body of the tongue are found deep red glands in this haematoxylin & eosin stained section.
surface papillae
(filiform)
musculature
glands
250 µm

56. SLIDE 4 Lingual glands (mouse)
At higher magnification:
Acini of cuboidal epithelium with round basal nuclei, cytoplasm staining pink.
Is this a serous or mucous gland?
striated muscle
acini
50 µm

57. SLIDE 4 Lingual glands (mouse)
At higher magnification:
Acini of cuboidal epithelium with round basal nuclei, cytoplasm staining pink.
Is this a serous or mucous gland? Serous.
striated muscle
acini
50 µm

58. SLIDE 4 Lingual glands (mouse)
In the root of the tongue.
Glands seen here are of a blue-purple colour in a haematoxylin & eosin stained section.
glands
250 µm

59. SLIDE 4 Lingual glands (mouse)
At higher magnification:
Acini with flattened basal nuclei, cytoplasm blue and of a ‘foamy’ appearance.
Is this a serous or mucous gland?
cells of acini with a
‘foamy’appearance
50 µm

60. SLIDE 4 Lingual glands (mouse)
At higher magnification:
Acini with flattened basal nuclei, cytoplasm blue and of a ‘foamy’ appearance.
Is this a serous or mucous gland? Mucous.
cells of acini with a
‘foamy’appearance
50 µm

61. SLIDE 5 Filiform papillae (cat)
Identify the main papillae in this section.
1.0 mm

62. SLIDE 5 Filiform papillae (cat)
Identify the main papillae in this section.
Filiform papillae (arrowed).
folds in section
1.0 mm

63. SLIDE 5 Filiform papillae (cat)
Decide whether : glands :
taste buds :
lymphatic tissue :
can be associated with these papillae.
0.5 mm

64. SLIDE 5 Filiform papillae (cat)
Decide whether : glands : No
taste buds :
lymphatic tissue :
can be associated with these papillae.
0.5 mm

65. SLIDE 5 Filiform papillae (cat)
Decide whether : glands : No
taste buds : No
lymphatic tissue :
can be associated with these papillae.
0.5 mm

66. SLIDE 5 Filiform papillae (cat)
Decide whether : glands : No
taste buds : No
lymphatic tissue : No
can be associated with these papillae.
0.5 mm

67. SLIDE 5 Filiform papillae (cat)
At a higher magnification the stratified squamous epithelium of the papillae can be seen to possess a very thick heavily keratinised surface.
250 µm
50 µm

68. SLIDE 6 Circumvallate papillae (goat)
Identify the main papilla in this section.
1.0 mm

69. SLIDE 6 Circumvallate papillae (goat)
Identify the main papilla in this section.
Circumvallate (vallate) papilla (arrowed).
Identify the main papilla in this section.
1.0 mm

70. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands :
taste buds :
lymphatic tissue :
can be associated with this papilla.
250 µm

71. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands : Yes
taste buds :
lymphatic tissue :
can be associated with this papilla.
250 µm

72. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands : Yes
taste buds : Yes
lymphatic tissue :
can be associated with this papilla.
250 µm

73. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands : Yes
taste buds : Yes
lymphatic tissue : Yes
can be associated with this papilla.
250 µm

74. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands : open into the moat around the papillae.
taste buds :
lymphatic tissue :
can be associated with this papilla.
1.0 mm
100 µm

75. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands :
taste buds : on the sides of the papillae.
lymphatic tissue :
can be associated with this papilla.
1.0 mm
50 µm

76. SLIDE 6 Circumvallate papillae (goat)
Decide whether : glands :
taste buds :
lymphatic tissue : found deeper into the papillae.
can be associated with this papilla.
1.0 mm
25 µm

77. SLIDE 7 Foliate papillae (cat)
Identify the main papillae in this section.
1.0 mm

78. SLIDE 7 Foliate papillae (cat)
Identify the main papillae in this section.
Foliate papillae form a series of parallel folds.
Identify the main papillae in this section.
foliate papillae
1.0 mm

79. SLIDE 7 Foliate papillae (cat)
Decide whether : glands :
taste buds :
lymphatic tissue :
can be associated with this papilla.
250 µm

80. SLIDE 7 Foliate papillae (cat)
Decide whether : glands : Yes
taste buds :
lymphatic tissue :
can be associated with this papilla.
250 µm

81. SLIDE 7 Foliate papillae (cat)
Decide whether : glands : Yes
taste buds : Yes
lymphatic tissue :
can be associated with this papilla.
250 µm

82. SLIDE 7 Foliate papillae (cat)
Decide whether : glands : Yes
taste buds : Yes
lymphatic tissue : Some (seen here labelled L)
can be associated with this papilla.
L : some lymphocytes L
250 µm

83. SLIDE 7 Foliate papillae (cat)
Decide whether : glands : seen deep in and between the papillae.
taste buds :
lymphatic tissue :
can be associated with this papilla.
1.0 mm
100 µm

84. SLIDE 7 Foliate papillae (cat)
Decide whether : glands :
taste buds : seen on the sides of the papillae.
lymphatic tissue :
can be associated with this papilla.
1.0 mm
100 µm

85. SLIDE 7 Foliate papillae (cat)
Decide whether : glands :
taste buds :
lymphatic tissue : see earlier picture.
can be associated with this papilla.
1.0 mm
100 µm

86. Lectures. Prof N. Stickland. Second Year Histology. 013. ORAL CAVITY 1
Lectures. Prof N.Stickland Second Year Histology ORAL CAVITY J.Bredl Gross Anatomy Correlates. Dr S.Frean Slides and Stains. Tanya Hopcroft Compressed version updated /7.