Nervous & Skeletal Systems. Virtual Science University

Transcription

1 Nervous & Skeletal Systems Virtual Science University 1

2 Nervous & Skeletal Systems Texas TEK B.10(A) The student will interpret the function of systems in organisms (humans) including the nervous and skeletal systems. Texas TEK B.10(B) The student will compare the interrelationships of nervous and skeletal systems to each other and to the body as a whole. 2

3 Who Is Brother Bones? Brother Bones consists of 206 Bones He has a AA Skeleton Appendicular Axial Skeleton 3

4 Axial Skeleton Anterior View of the Adult Skull 1. Frontal bone 2. Parietal bone 3. Nasal bone 4. Zygomatic bone 5. Vomer bone 6. Maxilla 7. Mandible 4

5 Axial Skeleton Anterior View of the Adult Skull Nasal Region Close-Up Mandible Close-Up 5

6 Axial Skeleton Lateral View of the Adult Skull Frontal bone Parietal bone Sphenoid bone Temporal bone Maxilla Zygomatic bone Mandible 6

7 Axial Skeleton - Infant Skull Sagittal suture Anterior (frontal) fontanel Coronal suture Frontal bones 7

8 Lateral View of the Adult Skull 8

9 Axial Skeleton Inferior View of the Adult Skull Hard palate Zygomatic bone Sphenoid bone Vomer bone Mandibular fossa Mastoid process Occipital condyle Foramen magnum Occipital bone 9

10 Openings - Axial Skeleton Floor of the Cranial Cavity Frontal bone Crista galli Sphenoid bone Sella turcica Temporal bone Jugular foramen Foramen magnum Parietal bone Occipital bone 10

11 Model of Auditory Ossicles Stapes (stirrup) Smallest bone in the body Incus (anvil) Malleus (hammer) 11

12 Axial Skeleton - Hyoid Bone Greater horns Lesser horns Body 12

13 Axial Skeleton Axis - Superior View Spinous process Vertebral foramen Transverse process Superior articular surface Odontoid process (dens) Articular facet 13

14 Axial Skeleton Lumbar Vertebra Superior View 1. Spinous process 2. Superior articular process 3. Transverse process 4. Vertebral foramen 5. Body 14

15 Comparison of Cervical, Thoracic and Lumbar Vertebrae 15

16 Axial Skeleton The Sacrum-Anterior View Sacral promontory Sacral foramen Coccyx 16

17 Axial Skeleton - Typical Rib Tubercle Neck Head Shaft (body) Anterior (sternal) end 17

18 Axial Skeleton - Sternum Manubrium Costal cartilage Body Xiphoid process 18

19 Appendicular Skeleton Pectoral Girdle - Anterior View Clavicle Scapula Humerus Sternum 19

20 Appendicular Skeleton Pectoral Girdle Posterior View First rib Scapula Humerus Cervical vertebrae Thoracic vertebrae 20

21 Appendicular Skeleton Right 21

22 Appendicular Skeleton Right Scapula-Lateral View Acromion process Coracoid process Glenoid cavity Lateral (axillary) border Spine 22

23 Appendicular Skeleton The Humerus 23

24 Appendicular Skeleton The Radius & The Ulna 24

25 Appendicular Skeleton Bones of the Hand Ulna Radius Carpal Metacarpal Phalanx 25

26 Appendicular Skeleton The Pelvic Girdle-Anterior View Last lumbar vertebra (L5) Sacrum Coccyx Ischium Pubis Ilium Obturator foramen Femur 26

27 Appendicular Skeleton Pelvic Girdle Posterior View Last lumbar vertebra (L5) Sacrum Coccyx Ischium Ilium Obturator foramen Femur 27

28 Appendicular Skeleton The Right Coxa Iliac crest Iliac fossa Anterior superior iliac spine Anterior inferior iliac spine Superior ramus of the pubis Obturator foramen Inferior ramus of the pubis Lesser sciatic notch Ischial spine Greater sciatic notch Posterior superior iliac spine 28

29 Appendicular Skeleton The Left Coxa-Medial View 29

30 Appendicular Skeleton The Femur 30

31 Appendicular Skeleton The Tibia & The Fibula 31

32 Appendicular Skeleton Bones of the Foot Lateral View Tibia Fibula Tarsals Calcaneus Talus Cuboid Navicular Lateral cuneiform Intermediate cuneiform Metatarsals Phalanges 32

33 Appendicular Skeleton The Patella and Knee Joint Patella Femur Tibia Fibula 33

34 Nervous System Glossary of Terms Nerve is a network of nerve fibers through which impulses travel between the central nervous system and other parts of the body. Dendrite is an extension of a neuron made up of cytoplasm that receives stimuli. Axon is an extension of a neuron that is elongated and carries impulses away from the body. Neuron is another name for nerve cell that is specialized to receive and conduct electrical impulses. 34

35 Nervous System Glossary of Terms Synapse is a junction or intersection at which a neuron meets another cell. Neurotransmitter is a chemical substance that transmits nerve impulses across a synapse. Action Potential is a sudden change in the polarity of the membrane of a neuron or muscle fiber that facilitates the transmission of electrical impulses. Membrane Potential is the difference in electric potential between the two sides of a cell membrane. 35

36 Nervous System Glossary of Terms Resting Potential is a period when the cell is resting and there is an electric potential across the cell membrane of a nerve cell or muscle cell. Central Nervous System s main function is to control the flow of information in the body. Peripheral Nervous System is all of the parts of the nervous system except the brain and the spinal cord. Sensory Neuron is a neuron that carries stimuli from a sense organ to the central nervous system. Motor Neuron is a neuron that conducts nerve impulses from the central nervous system to the muscles and glands. 36

37 Nervous System Glossary of Terms Motor Neuron Brain Cerebrum Cerebellum Brain Stem Thalamus Hypothalamus Spinal cord Reflex Interneuron Sensory Receptor Retina Rod Cone Optic Nerve Cochlea Semicircular Canal 37

38 Neurons Structure & Function The human brain contains approximately 100 billion nerve cells, which are also called neurons. There are many different types of neurons in the nervous system that differ in appearance. All neurons have some common structural features that allow them to transmit and receive messages. 38

39 Neurons Structure & Function The basic parts of neurons are the Cell body Dendrites Axon Axon terminal 39

40 Neurons Structure & Function The cell body and dendrites function as the receptive part of the cell. The axon and axon terminal are involved in transmission of messages to other cells. A single neuron can cell can receive messages from thousands of other neurons. 40

41 Neurons Structure & Function Nerve cells stimulate muscle cells, and thus control our movements. Transmission of messages from neurons to muscles are the same as those between nerve cells. 41

42 Neurons Sending Messages Neurons in the spinal cord directly control our muscles Neuro-muscular communication Neurons located in the spinal cord project their axons directly to skeletal muscles. 42

43 Neurons Sending Messages These cells are called motor neurons and receive messages from the motor cortex The axon terminal of the motor neuron comes very close to the muscle cell, but does not touch the muscle. 43

44 Neurons Sending Messages There is a very small space between the axon terminal and the muscle cell Known as the synaptic cleft This small region that includes the axon terminal, synaptic cleft, and adjacent part of the muscle cell Known as the synapse 44

45 Neurons Sending Messages The motor neuron gets excited electrically by receiving a series of chemical messages from the motor cortex. When a threshold level of excitation is reached in the cell body, a burst of electrical activity is produced in the axon that is propagated to the axon terminal. 45

46 Neurons Sending Messages This burst of electrical excitation is called the action potential. When the action potential reaches the axon terminal, a release of chemicals (molecules) known as neurotransmitters is induced. 46

47 Neurons Sending Messages The neurotransmitter molecules travel across the synaptic cleft and bind to specialized receptors on the muscle cell. When the neurotransmitter binds to the receptor, electrical activity is induced in the muscle and this causes a complex series of biochemical events to occur within the muscle cell that results in muscle contraction and movement of body parts. 47

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