NEET-XII-Physics
Previous Year Paper year:2017
Qstn# 180 Prvs-Qstn
- #180Select the correct option.
(1) 8th, 9th and 10th pairs of ribs articulate
directly with the sternum.
(2) 11th and 12th pairs of ribs are connected to
the sternum with the help of hyaline
cartilage.
(3) Each rib is a flat thin bone and all the ribs
are connected dorsally to the thoracic
vertebrae and ventrally to the sternum.
(4) There are seven pairs of vertebrosternal,
three pairs of vertebrochondral and two
pairs of vertebral ribs.digAnsr: 4Ans : ( 4 )
Sol. • Vertebrosternal ribs are true ribs, dorsally
they are attached to the thoracic
vertebrae and ventrally connected to the
sternum with the help of hyaline cartilage.
First seven pairs of ribs are called true
ribs.
• 8th, 9th and 10th pairs of ribs do not
articulate directly with the sternum but
join the seventh ribs with the help of
hyaline cartilage. These are
vertebrochondral or false ribs.
• Last 2 pairs (11 & 12) of ribs are not
connected ventrally and are therefore,
called floating ribs.
• Only first seven pairs of ribs are ventrally
connected to the sternum.