Human Anatomy & PhysiologyLABORATORY9 AppendicularSkeletonresembling a boat (scoplros : boat), the lunate named forthe crescent moon, triquetrum (a triangle), pisiform beingpea-shaped, the trapezium (rhymes with thumb and namedfor a shape), the trapezoid (named for a shape), the capitatebeing "headlike," and the hamate (hamus: hook). Anotherway to put the bones in proper order is to use a mnemonicdevice that uses the first letter of each carpal bone (S forscaphoid, I for lunate, etc.) in a sentence: "Say Loudly ToPam, Time To Come Home." The carpal bones serve asregions of attachment for forearm muscles and for intrinsicmuscles of the hand.The metacarpals are the bones of the palm. Eachmetacarpal consists of a proximal base, a body, and a dis-tal head. The metacarpals are labeled by Roman numeralsI to V with I being proximal to the thumb and V beingproximal 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 skeletalmaterial and on your own hand and note the substantialrange of movement. This type of movement is covered ingreater 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 are14 bones that make up this group. The thumb is called thepollex.
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