Q All are composite muscles EXCEPT:
A. Pectineus
B. Flexor Carpi ulnaris
C. Biceps femoris
D. Flexor digitorum profundus
Explanation
Correct Answer: B. Flexor carpi ulnaris
• Flexor carpi ulnaris is supplied by a single nerve and is not a composite/hybrid muscle.
• Composite/hybrid muscles have more than one set of fibres and are supplied usually by different nerves for different set of fibres.
• Pectineus has anterior set of fibres supplied by the femoral nerve, whereas, posterior set of fibres may be supplied by the obturator nerve.
• Long head of biceps femoris is supplied by the tibial part of sciatic nerve, and the short head is supplied by the common peroneal nerve. This reflects the composite derivation from the flexor and extensor musculature.
• Radial half of flexor digitorum profundus is supplied by the median nerve and the ulnar half is supplied by the ulnar nerve.
A. Pectineus B. Flexor Carpi ulnaris C. Biceps femoris D. Flexor digitorum profundus Explanation
Correct Answer: B. Flexor carpi ulnaris
• Flexor carpi ulnaris is supplied by a single nerve and is not a composite/hybrid muscle.
• Composite/hybrid muscles have more than one set of fibres and are supplied usually by different nerves for different set of fibres.
• Pectineus has anterior set of fibres supplied by the femoral nerve, whereas, posterior set of fibres may be supplied by the obturator nerve.
• Long head of biceps femoris is supplied by the tibial part of sciatic nerve, and the short head is supplied by the common peroneal nerve. This reflects the composite derivation from the flexor and extensor musculature.
• Radial half of flexor digitorum profundus is supplied by the median nerve and the ulnar half is supplied by the ulnar nerve.