浙江大学医学院：感觉器官 EYES AND EARS（眼和耳）

EYES AND EARS

1 EYES AND EARS

GENERAL DESCRIPTION ■Eyes: VisUa| organ Ears the organ of hearing and equilibrium. The equilibrium sense, generally associated with balance, provides feedback about the positions and movements of our heads and bodies in space

2 GENERAL DESCRIPTION ◼ Eyes: visual organ ◼ Ears:the organ of hearing and equilibrium. The equilibrium sense, generally associated with balance, provides feedback about the positions and movements of our heads and bodies in space

OBJECTIVES Know the general layers of the eye. Describe the structure of Cornea and its reason of transparent. Describe the structure of retina and the function of pigment cell, rod cell and cone cell. Know the definition of ora serrata. macula lutea, fovea centralis and optic disc Know the general structure of ear Describe six sensory regions of the membranous labyrinth and heir function

3 OBJECTIVES • Know the general layers of the eye. • Describe the structure of Cornea and its reason of transparent. • Describe the structure of Retina and the function of pigment cell, rod cell and cone cell. • Know the definition of Ora serrata, Macula lutea, Fovea centralis and Optic disc. • Know the general structure of ear. • Describe six sensory regions of the membranous labyrinth and their function

THE EYE 眉 结膜半月襞 Plica semilunaris conjunctivae 上瞼 Palpebra superior 泪阜 Caruncula lacrimas 瞳孔 泪湖 Lacus lacrimalis 外眦 Angulus oculi lateralis 内眦 球结膜 Tunica conjunctiva bulbi 泪乳头 Papilla lacrimalis 缘 neae 泪点 Punctum lacrimale 睑 320.右眼前面观 Anterior aspect of the right eye 4

4 THE EYE

Fibrous layer als Ⅴ ascular layer ey reball Retina eye Content: Aqueous humor、Lens、 Ⅴ itreous bod y Accesory structure: Eyelid Muscles of the eye Lacrimal gland

5 eyeball Accesory structure:Eyelid、Muscles of the eye、 Lacrimal gland Walls Content：Aqueous humor、Lens、 Vitreous body Fibrous layer Vascular layer Retina eye

Eyeball walls Cornea 1 /6 Fibrous layers Sclera 5/6 Choroid 2/3 Eye ball vascular layers Ciliary body rIs Retina 6

6 Ciliary body Eyeball Walls Fibrous layers Eye ball Vascular layers Retina Cornea 1/6 Sclera 5/6 Choroid 2/3 Iris

D C B ornea M Colorless, transparent 5 layers: epithellum Bowman’ s membrane Stroma Descemet’ s membrane Cornea H&E Low endothelium E· corneal epithelium;D· Descemet membrane :b- Bowman s membrane P-substantia propria

7 Cornea Colorless, transparent 5 layers: epithelium Bowman’s membrane Stroma Descemet’s membrane endothelium

keratin Cornea a epithelium: Non-keratinized stratified squamous epi. 5-6 layers Numerous mitotic figures B No vessels Free nerve ending b. Bowman's membrane( anterior Corneal epithelium H&E High arrows-lens fibers(young); basement membrane) P-substantia propria; B-Bowman's membrane An accellular homogeneous membrane (collagen fibrils Stability strength, no regeneration

8 Cornea a.epithelium: ◼ Non-keratinized stratified squamous epi. ◼ 5-6 layers ◼ Numerous mitotic figures ◼ No vessels. ◼ Free nerve ending b.Bowman’s membrane( anterior basement membrane) ◼ An accellular homogeneous membrane (collagen fibrils) ◼ Stability & strength, no regeneration keratin

C Stroma or substantia propria Several lamellae of fine collagen f network Flattened fibroblasts G.S. richin chrodroitin sulfate D. Descemet's membrane (posterior limiting lamina) D Acellular homogeneous membrane M Can be repaired by endothelial cells K E Endothelium Cornea h&E Med Like mesothelium in its morphology E- corneal epithelium; D-Descemet's Regulate the water content of the membrane:b- 's membrane. stroma> maintain transparency P-substantia propria; K-keratocyte

9 C. Stroma or substantia propria ◼ Several lamellae of fine collagen f.network ◼ Flattened fibroblasts ◼ G.S.rich in chrodroitin sulfate D. Descemet’s membrane (posterior limiting lamina) ◼ Acellular homogeneous membrane ◼ Can be repaired by endothelial cells E.Endothelium ◼ Like mesothelium in its morphology ◼ Regulate the water content of the stroma → maintain transparency

胶原板层电镜图 相邻胶原板 层的纤维方 向垂直 胶原板层 纵断面 胶原板层 横断面 10

10 胶原板层电镜图 相邻胶原板 层的纤维方 向垂直 胶原板层 纵断面 胶原板层 横断面