Yellow bone marrow are found specifically in the bone marrow of

(a) Long bones

(b) Spongy bones

(c) Short bones

(d) All of the above

Yellow Bone Marrow is primarily located in the central cavities of long bones, surrounded by layers of red bone marrow within a reticular framework. Its main function is fat storage and maintaining a suitable environment for bone function. In special conditions, such as severe blood loss, yellow marrow can revert to red bone marrow to produce blood cells.

Additional Information:
Bone marrow is a semi-fluid tissue found mainly in the cancellous (spongy) portions of bones. It is composed of hematopoietic cells, adipose tissue, and supportive stromal cells, and serves as the primary blood cell-producing organ, generating nearly 500 billion blood cells daily. Hematopoietic stem cells in the marrow give rise to all three types of blood cells.

There are two types of bone marrow:

• Red Bone Marrow: Abundant in newborns, gradually converts to yellow marrow with age. Found in pelvic bones, ribs, cranium, sternum, vertebrae, and epiphyseal ends of long bones, it is essential for blood cell production.
• Yellow Bone Marrow: Found in flat and long bones (hip, skull, ribs, vertebrae), it is yellow due to carotenoids in fat droplets, stores energy as fat, and can produce blood cells when needed. It also has the ability to convert into cartilage or bone in emergencies.

Hence, the correct answer is: Long bones.