Homologous organs: vertebrate forelimbsसमजात अंग: कशेरुकियों के अग्रपाद

NCERT Fig 6.3 (b) · Class 12 Biology · Chapter 6 · interactive diagram

Parts and their functions

• Humerus (ह्यूमरस (प्रगंडिका)) — The single upper-arm bone. Present in the forelimb of human, cheetah, whale and bat.
• Radius (रेडियस (बहिःप्रकोष्ठिका)) — One of the two forearm bones. Long in the bat wing, short and flat in the whale flipper.
• Ulna (अल्ना (अंतःप्रकोष्ठिका)) — The second forearm bone, beside the radius. Thin and reduced in the bat.
• Carpals (wrist bones) (कार्पल्स (कलाई की हड्डियाँ)) — Small wrist bones between the forearm and the palm.
• Metacarpals (palm bones) (मेटाकार्पल्स (हथेली की हड्डियाँ)) — Palm bones. Very long in the bat — they hold the wing skin open.
• Phalanges (finger bones) (फैलेंजेस (अंगुलियों की हड्डियाँ)) — Finger bones. Long in the whale flipper, short in the cheetah paw, free and movable in the human hand.

Original diagram drawn by Simple Learning Hub, based on NCERT Fig 6.3 (b). Report a mistake