The miniature version of the desk model has a movable jaw with a spring attached to it. The skull can be opened to observe its internal structure, and the arms and legs can be disassembled to facilitate a separate study. For students to understand the relationship between skeletal scaffolding and form.There are 206 bones in the human bone, which are divided into the trunk bone, the skull and the four limbs. The connections between the bones constitute the skeleton. (such as protecting the brain, chest protector, lung, etc.) Skeletal muscle passes over one or more joints and is attached to two or more bone surfaces. Under the control of the nervous system, skeletal muscles contract and pull the bones to produce various movements. The surface of the bone is dense and hard, called bone dense; The inside of the bone is a honeycomb, called cancellous bone; The cavity in the bone is called the bone marrow cavity, and the center is filled with marrow. The bone marrow of the fetus and the child is red bone marrow, which is the hematopoietic organ. As the age increases, the red bone marrow in the bone marrow cavity is replaced by adipose tissue and becomes yellow bone marrow. Bones: there are 206 bones in adults, and bone and bone are connected to each other to form bones, supporting the body, exercising and protecting it. Among 206 bones, 23 cranial bones, 51 trunk bones, 4 limbs, irregular bone and 5 types of gas.

Size: 42CM, 26 * 16 * 10cm.