. Physiology, experimental and descriptive . cially the skull and spinal column, sothat you will know better what to do when dissecting thebrain and spinal cord in one of these animals. The bones make about, one-sixth of the weight of theliving body. When dried they may lose half of theirweight. Microscopic Structure of Bone. — 1. Hold a mountedcross section of bone up to the light, and examine it with ahand lens. The solid part of the bon« will be seen to bepierced by many small holes (or if the holes are filled theywill appear as black spots). These are the cross sections ofthe Haversian Can
. Physiology, experimental and descriptive . cially the skull and spinal column, sothat you will know better what to do when dissecting thebrain and spinal cord in one of these animals. The bones make about, one-sixth of the weight of theliving body. When dried they may lose half of theirweight. Microscopic Structure of Bone. — 1. Hold a mountedcross section of bone up to the light, and examine it with ahand lens. The solid part of the bon« will be seen to bepierced by many small holes (or if the holes are filled theywill appear as black spots). These are the cross sections ofthe Haversian Canals, .through which run the blood tubes,mainly lengthwise through the bone. 2. Examine the section under the microscope, using a half-inch objective. The bony matter will now be seen to be arranged in MINUTE STRUCTURE OF BONE. 353 circles, Lamellae, around the haversian canals, somewhat likethe rings seen on the end of a log. Between the rings are circles of elongated dark are Lacunae, cavities in which lay the bone corpuscles.
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