IMG_0051

IMG_0051 - Human Anatomy & Physiology LABORATORY9...

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LABORATORY9 AppendicularSkeleton resembling a boat (scoplros : boat), the lunate named for the crescent moon, triquetrum (a triangle), pisiform being pea-shaped, the trapezium (rhymes with thumb and named for a shape), the trapezoid (named for a shape), the capitate being "headlike," and the hamate (hamus: hook). Another way to put the bones in proper order is to use a mnemonic device that uses the first letter of each carpal bone (S for scaphoid, I for lunate, etc.) in a sentence: "Say Loudly To Pam, Time To Come Home." The carpal bones serve as regions of attachment for forearm muscles and for intrinsic muscles of the hand. The metacarpals are the bones of the palm. Each metacarpal consists of a proximal base, a body, and a dis- tal head. The metacarpals are labeled by Roman numerals I to V with I being proximal to the thumb and V being proximal to the little finger. Metacarpals II to V have little *movement, but metacarpal I allows for significant move- ment of the thumb. Locate metacarpal I on the skeletal material and on your own hand and note the substantial range of movement. This type of movement is covered in greater detail in Laboratory Exercise 12. Examine the car- pals and metacarpals in the lab and in figure 9.6. Distal to the metacarpals are the phalanges. There are 14 bones that make up this group. The thumb is called the pollex. Each finger ofthe hand has three phalanges, a proxi-
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This note was uploaded on 02/09/2012 for the course BIO 102 taught by Professor William during the Spring '11 term at Harvard.

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