Part 4

40. Isolated retina 84

41. The beginning of the cutting of the eye for sagittal sections 87

42. Method of cutting through the crystalline lens 88

43. Cutting through cornea to complete the sagittal sections 89

44. Sagittal section enlarged 90

45. Part of calf’s head showing knitting needles inserted in puncta 93

46. Course of knitting needles showing the course of the canaliculi 94

47. Initial cuts to be made in the skin 98

48. First cut in bones of orbit 99

49. All the cuts to be made in bones of orbit 100

50. How to pry bone loose 101

51. Dissecting close to bones of orbit 102

52. Excavated orbit 103

53. Anterior view of enucleated eye 104

54. Side view of enucleated eye. All parts in situ 104

55. Enlarging pupil for ophthalmoscopic inspection 107

56. How to get rid of the pucker in the cornea 108

57. Window cut in the eye 110

58. Pins inserted in lacrimal ducts 112

59. Capsule of Tenon blown up 115

60. Showing the extrinsic muscles of the eye 118

61. Cutting through the iris 120

62. Scraping ciliary processes free. Choroid cut around ciliary ring 121

63. Cutting away choroid 122

64. Three tunics, hyaloid, and lens 123

PREFACE

The aim of this booklet is to present to the eye-specialist, the teacher, the student, and others interested in the study of the anatomy and physiology of the eye, some definite methods to follow in the dissection of that organ.

Most dissections of the eye are not made with the same degree of care and skill used in the dissections of other organs. In following the usual method of dissecting eyes, much of the important detail is lost. Often certain membranes are confounded with others, and wrongly demonstrated. Furthermore, an eye is merely divided by some demonstrators into an anterior and a posterior half, a very short time is spent by the students scrutinizing each half; then the text-book is turned to, and the anatomy is studied descriptively.