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Chapter 11: The Early Hominins of the Pliocene 293 FIGURE 11.21 A. sediba, hand. Asymmetry of metacarpal heads Well-developed flexor sheaths Moderate phalangeal curvature Gracile metacarpal shafts Well-developed flexor pollicus longus Expanded apical tufts Long thumb relative to fingers Well-developed intrinsic muscles of the thumb Moderately deep carpal tunnel Australopith-like carpometacarpal joints Homo-like scaphoid © Cengage FIGURE 11.22 Gorilla, chimpanzee, and human hand. 4. Compare the hands of Australopithecus sediba (Figure 11.21) to those of gorilla, chimp, and human (Figure 11.22). How do they compare?

          Chapter 11: The Early Hominins of the Pliocene 293
FIGURE 11.21 A. sediba, hand.
Asymmetry of
metacarpal heads
Well-developed
flexor sheaths
Moderate
phalangeal
curvature
Gracile
metacarpal
shafts
Well-developed
flexor pollicus longus
Expanded
apical tufts
Long thumb
relative
to fingers
Well-developed
intrinsic muscles
of the thumb
Moderately
deep carpal
tunnel
Australopith-like
carpometacarpal
joints
Homo-like
scaphoid
© Cengage
FIGURE 11.22 Gorilla,
chimpanzee, and human hand.
4. Compare the hands of Australopithecus sediba (Figure 11.21) to those of gorilla, chimp, and
human (Figure 11.22). How do they compare?

Chapter 11: The Early Hominins of the Pliocene 293
FIGURE 11.21 A. sediba, hand.
Asymmetry of
metacarpal heads
Well-developed
flexor sheaths
Moderate
phalangeal
curvature
Gracile
metacarpal
shafts
Well-developed
flexor pollicus longus
Expanded
apical tufts
Long thumb
relative
to fingers
Well-developed
intrinsic muscles
of the thumb
Moderately
deep carpal
tunnel
Australopith-like
carpometacarpal
joints
Homo-like
scaphoid
© Cengage
FIGURE 11.22 Gorilla,
chimpanzee, and human hand.
4. Compare the hands of Australopithecus sediba (Figure 11.21) to those of gorilla, chimp, and
human (Figure 11.22). How do they compare?

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