In comparison to palisade parenchyma, spongy parenchyma cells have a low number of chloroplasts. 1. Spongy bone is usually located at the ends of the long bones (the epiphyses), with the harder compact bone surrounding it. Lastly, palisade layer helps in photosynthesis, (in fact palisade cells are the site of photosynthesis) while the air pockets in the spongy layer allow exchange of gases like CO2 required for photosynthesis. Flat bones consist of two layers of compact bone surrounding a layer of spongy bone. We can also label this on our leaf diagram. The spongy layer of a leaf, which lies beneath the palisade layer, consists of cells that are irregular in shape and loosely packed. 3. In plants, it is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf.The spongy mesophyll's function is to allow for the interchange of gases (CO2) that are needed for photosynthesis. Articulations are places where two bones meet. Lying beneath the palisade layer, its cells are irregular in shape and loosely packed. Collectively, the area that contains the palisade and spongy layers is known as the mesophyll. #CarryOnLearning. Bone Markings The surface features of bones vary considerably, depending on the function and location in the body. Spongy tissue is a type of tissue found both in plants and animals.. Although they contain a few chloroplasts, their main function seems to be the temporary storage of sugars and amino acids synthesized in the palisade layer. Visit BYJU’S to learn more differences. 1. 3. The main difference between spongy and compact bones is their structure and function. Spongy mesophyll. The main function of compact bone is to support the whole body, whereas spongy bones support the body structure. Hence, the upper mesophyll layer appears in dark green while the lower mesophyll layer appears in less green. Compared to the cells of the palisade layer, those of the spongy layer are spherical in shape or may be irregularly shaped (isodiametric) in some plants. Compact bone is hard and forms the outer layer of any bone. It is highly vascularized and contains red bone marrow. 2. Spongy Bone Definition. The spongy layer is the more open space found directly below the palisade layer. The outer surface of bone, except in regions covered with articular cartilage, is covered with a fibrous membrane called the periosteum. ans:. This cross-section of a flat bone shows the spongy bone (diploë) lined on either side by a layer of compact bone. They also aid in the exchange of gases between the leaf and the environment. These cells possess large concentration of chloroplast. Spongy layer. The palisade layer is found below the upper epidermis. Within the spongy layer you can see the air pockets as well as the vascular bundle containing the xylem and phloem. Thus, this summarizes the difference between palisade parenchyma and spongy parenchyma. The spongy mesophyll's function is to allow for the interchange of gases (CO2) that are needed for photosynthesis.. Reference: 1. Explanation: Hope it help. Cells compactly arranged at right angle to the epidermis. Cells are with large inter cellular space. Also Read: … Answer: what is the function of spongy layer? Bone markings depend on the function and location of bones. 2. Sengbusch, Peter v. Compact bones are the present in the outer layer of long bones, while spongy bones are present in the middle of the long bones. In plants, it is part of the mesophyll, where it forms a layer next to the palisade cells in the leaf. The spongy mesophyll is found towards the lower epidermis. Cells of the spongy mesophyll tissue are located below the palisade tissue and above the lower epidermis. Spongy bone, also known as cancellous bone or trabecular bone, is a very porous type of bone found in animals. 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