The correct pathway of milk ejection from mammary glands is
(i) Sensory impulses are transmitted through somatic nerve from the nipples to the mother's spinal cord and then to her hypothalamus.
(ii) Expulsion of milk from alveoli into the ducts.
(iii) Suckling action of baby on the breast.
(iv) Contraction of myoepithelial cells.
(v) Secretion of oxytocin.

Options

A. (iv) ,(iii) ,(v) ,(i) & (ii)
B. (iii) ,(i) ,(v) ,(ii) & (iv)
C. (iii) ,(i) ,(v) ,(iv) & (ii)
D. (iv) ,(iii) ,(i) ,(v) & (ii)

Answer

To determine the correct pathway of milk ejection from the mammary glands, we can break down the steps involved in this physiological process. Here’s a step-by-step explanation:

### Step 1: Suckling Action of the Baby
The process begins with the **suckling action of the baby on the breast**. This action serves as the initial stimulus that triggers the entire milk ejection reflex.

**Hint:** Remember that the baby's suckling is essential for initiating the milk ejection process.

### Step 2: Sensory Impulses Transmission
Once the baby suckles, sensory receptors in the nipple are activated. This leads to **sensory impulses being transmitted through somatic nerves from the nipples to the mother's spinal cord and then to her hypothalamus**.

**Hint:** Think of this step as the communication pathway that informs the mother’s brain that the baby is feeding.

### Step 3: Secretion of Oxytocin
The hypothalamus responds to the sensory signals by sending nerve signals that promote the **secretion of oxytocin** from the posterior pituitary gland. Oxytocin is a key hormone in the milk ejection process.

**Hint:** Oxytocin is often referred to as the "milk let-down hormone," so keep that in mind.

### Step 4: Contraction of Myoepithelial Cells
Following the secretion of oxytocin, there is a **contraction of myoepithelial cells** surrounding the alveoli in the mammary glands. This contraction helps to push the milk out of the alveoli.

**Hint:** Myoepithelial cells act like tiny muscles that help squeeze the milk out.

### Step 5: Expulsion of Milk
Finally, the milk is **expelled from the alveoli into the ducts** of the mammary glands, making it available for the baby to drink.

**Hint:** This is the final step where the milk actually moves into the ducts for the baby to access.

### Summary of the Correct Pathway:
The correct sequence of events for milk ejection is:
1. Suckling action of the baby (Stimulus)
2. Sensory impulses transmitted to the spinal cord and hypothalamus
3. Secretion of oxytocin
4. Contraction of myoepithelial cells
5. Expulsion of milk from alveoli into ducts

### Final Answer:
The correct pathway of milk ejection from mammary glands is:
(iii) Suckling action of baby on the breast → (i) Sensory impulses transmitted → (v) Secretion of oxytocin → (iv) Contraction of myoepithelial cells → (ii) Expulsion of milk from alveoli into the ducts.

**Correct Option:** The third option in the provided choices is correct.