Question

1. complete the following statements by inserting your responses in the answer blanks. 1. the ventral rami of spinal nerves ( c_1 ) through ( t_1 ) and ( l_1 ) through ( s_4 ) take part in forming (1), which serve the (2) of the body. the ventral rami of ( t_1 ) through ( t_{12} ) run between the ribs to serve the (3). the posterior rami of the spinal nerves serve the (4). 2. 3. 4.

Explanation:

• For (1): Spinal nerve plexuses are formed by the ventral rami of certain spinal nerves (like \(C_1 - T_1\) and \(L_1 - S_4\)).
• For (2): Plexuses formed by these ventral rami supply the limbs.
• For (3): The ventral rami of \(T_1 - T_{12}\) (intercostal nerves) serve the thoracic wall (including the intercostal muscles and overlying skin).
• For (4): The posterior rami of spinal nerves supply the posterior (dorsal) trunk muscles and the skin of the back.

Answer:

1. (1) plexuses; (2) limbs
2. (3) thoracic wall
3. (4) posterior (dorsal) trunk muscles and the skin of the back