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