Anatomy and physiology : designed for academies and families . , a, o. The pubic portion of the innominata; d, the arch of the pubea; e, theJunction of the sacrum and lower lumbar vertebra. The coccyx, in infants, consists of several pieces, which,in youth, become united into one bone. This is the termi-nal extremity of the spinal column. These bones form thewalls of a cavity named the pelvis. BONES OF THE EXTREMITIES. The bones of the upper and lower limbs are enlargedat each extremity, and have projections that are called pro-cesses. To these the tendons of muscles and ligaments areattached,
Anatomy and physiology : designed for academies and families . , a, o. The pubic portion of the innominata; d, the arch of the pubea; e, theJunction of the sacrum and lower lumbar vertebra. The coccyx, in infants, consists of several pieces, which,in youth, become united into one bone. This is the termi-nal extremity of the spinal column. These bones form thewalls of a cavity named the pelvis. BONES OF THE EXTREMITIES. The bones of the upper and lower limbs are enlargedat each extremity, and have projections that are called pro-cesses. To these the tendons of muscles and ligaments areattached, which connect one bone with another. The shaftof these bones is cylindrical and hollow. In structure theirexterior surface is hard and compact, while the interior por- Describe the sacrum. Describe the coccyx. Describe the bones of thetipper and lower extremities. What is said of their structure ? BONES OF THE UPPER EXTREMITIES. 73 tion is of a reticulated character. The enlarged extremitiesof the round bones are more porous than the main shaft. Fig. 25. *8. Fig. 25 represents a section of the thigh bone; a, a, the extremities, having ashell, or thin plate of compact texture covering small cells, diminishing in size, butincreasing in number, as they approach the articulation ; c, the cavity that containsthe marrow; 6, 6, the walls of the shaft, which are very firm and solid. BONES OF THE UPPER EXTREMITIES. The upper extremities contain the clavuie, or collar bone,the scapula, or shoulder bone, the humerus, or first bone ofthe arm, the two bones of the fore-arm, eight bones in thewrist, Jive in the hand, fourteen in the fingers and thumb, —making sixty-four in both arms and hands. The clavicle is attached, at one extremity, to the ster-num ; at the other, it is united to the scapula. It is shapedlike the italic/. Its use is to keep the arms from slidingtowards the breast. This bone can be lengthened by throw-ing the arms back, consequently enlarging the chest. TheFrench have
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
