![This is blank.](https://digitalhistology.org/wp-content/themes/histology-unified/imgs/trans.png)
Cortex: Medullary ray
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x
![Convoluted portion <p>Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/Or.Ur_.Tub-9-1-ping.png)
Convoluted portion
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x
![- Renal corpuscle <p>Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/Or.Ur_.Tub-9-6-ping.png)
- Renal corpuscle
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x
![Medullary ray <p>Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/Or.Ur_.Tub-9-2-ping.png)
Medullary ray
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x
![- Proximal straight tubules <p>Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/Or.Ur_.Tub-9-3-ping.png)
- Proximal straight tubules
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x
![- Ascending thick limb <p>Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/Or.Ur_.Tub-9-4-ping.png)
- Ascending thick limb
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x
![- Collecting ducts <p>Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x</p>](https://digitalhistology.org/wp-content/uploads/2018/02/Or.Ur_.Tub-9-5-ping.png)
- Collecting ducts
Medullary rays separate convoluted portions of the cortex and form the core of a renal lobule. Straight portions of proximal tubules and thick ascending limbs (distal straight tubules) are located in the medullary rays and are similar in appearance to their respective convoluted portions. Collecting ducts are also present in the medullary ray. 200x