By QA international Collectif
With 6 trillion cells, 206 bones, and six hundred muscular tissues, the human physique is an grand dwelling mechanism that's in severe and incessant activity.
For all curious readers, the data publications open the door to a global of complicated and beautiful phenomena.
Accurate, specific visible details is all outlined in lay language to make it without difficulty available to the non-expert. Definitions to medical phrases are given both within the clarification itself, or within the entire glossary.
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Extra info for Understanding the Human Body
At birth E, the cerebrum is the largest part of the brain. Convolutions have formed on its surface. forebrain hindbrain cerebrum midbrain midbrain forebrain cerebellum eye bud spinal bulb cranial nerves Q 0 spinal cord W 0 brain stem E 0 cerebellum 51 The nervous system The peripheral nervous system A network of sensory and motor nerves The central nervous system communicates with the rest of the body via 43 pairs of nerves: 12 pairs of cranial nerves directly connected to the cerebrum, and 31 pairs of spinal nerves linked to the spinal cord.
The message reaches the brain stem W, then descends the spinal cord E. It then travels along a spinal nerve that stimulates the targeted muscle R. The sensory receptors of the muscle emit a message to control the movement. This signal returns to the cerebellum T, which compares the movement made with movements learned and remembered since childhood. The cerebellum sends an inhibiting message Y to the muscle to control its activity. In parallel, it acts on the motor cortex through the thalamus U, to adjust the command.
Tibia 32 cruciate ligaments medial collateral ligament DIFFERENT TYPES OF SYNOVIAL JOINTS Gliding joints permit only small lateral movements. They are found between the vertebrae and the ribs, in the carpus and tarsus, and between the navicular bone and the cuneiform bones. navicular bone first cuneiform bone The elbow is a hinge joint (or trochlear joint) that allows flexion and extension along a single axis. The convex projection of the humerus turns within the hollow of the ulna. humerus The architecture of the body The synovial joints are divided into six categories according to the nature of the movements they permit: gliding, hinge, pivot, ball, ellipsoidal, and saddle.