Crosssection Through The Medulla Figure

Pons Cross Section

The hypoglossal nucleus of CN XII 2. The medial lemniscus, which contains crossed fibers from the gracile and cuneate nuclei 3. The pyramid corticospinal tracts Lateral geniculate body Medial geniculate body Crus cerebri Superior cerebellar peduncle Middle cerebellar peduncle Inferior cerebellar peduncle Gracile tubercle Cuneate fasciculus Gracile fasciculus Figure 9-1. The dorsal surface of the brain stem. The three cerebellar peduncles have been removed to expose the rhomboid fossa. The...

Internal Capsule Function

Lateral Geniculate Body

The thalamus is the largest division of the diencephalon. It plays an important role in the integration of the sensory and motor systems. II. MAJOR THALAMIC NUCLEI AND THEIR CONNECTIONS Figure 16-1 A. The anterior nucleus receives hypothalamic input from the mamillary nucleus through the mamillothalamic tract. It projects to the cingulate gyrus and is part of the Papez circuit of emotion of the limbic system. B. The mediodorsal dorsomedial nucleus is reciprocally connected to...

Left Inferior Quadrantanopia

Conjugate Gaze Palsies

The visual system is served by the optic nerve, which is a special somatic afferent nerve. II. THE VISUAL PATHWAY Figure 17-1 includes the following structures. A. Ganglion cells of the retina form the optic nerve cranial nerve CN II . They project from the nasal hemiretina to the contralateral lateral geniculate body and from the temporal hemiretina to the ipsilateral lateral geniculate body. Figure 17-1. The visual pathway from the retina to the visual cortex showing visual...

Diseases Of The Motor Neurons And Corticospinal Tracts Figures 81 and

Tabes Dorsal

Upper motor neuron UMN lesions are caused by transection of the corticospinal tract or destruction of the cortical cells of origin. They result in spastic paresis with pyramidal signs Babinskis sign . B. Lower motor neuron LMN lesions are caused by damage to the motor neurons. They result in flaccid paralysis, areflexia, atrophy, fasciculations, and fibrillations. Poliomyelitis or Werdnig-Hoffman disease see Figure 8-2A results from damage to the motor neurons. Gracile fasciculus, Cuneate...

Cross Sectional Anatomy of the Brain

Mid Sagittal Brain Fornix

The illustrations in this chapter are accompanied by corresponding magnetic resonance imaging MRI scans. Together they represent a mini-atlas of brain slices in the three orthogonal planes i.e., midsagittal, coronal, and axial . An insert on each figure shows the level of the slice. The most commonly tested structures are labeled. II. MIDSAGITTAL SECTION Figures 1-1, 1-2, and 1-3 . The location of the structures shown in the figures should be known. Fornix column...

Dorsal Columnmedial Lemniscus Pathway Figure 72 see also Figure

Crura Cerebri Transection

The dorsal column-medial lemniscus pathway mediates tactile discrimination, vibration sensation, form recognition, and joint and muscle sensation conscious proprioception . B. Receptors include Pacini's and Meissner's tactile corpuscles, joint receptors, muscle spindles, and Golgi tendon organs. C. First-order neurons are located in the dorsal root ganglia at all levels. They project axons to the spinal cord through the medial root entry zone. First-order neurons give rise to 1....

Development of the Nervous System

Embryology Brain

. THE NEURAL TUBE Figure 4-1 gives rise to the central nervous system CNS i.e., brain and spinal cord . A. The brain stem and spinal cord have 1. An alar plate that gives rise to the sensory neurons 2. A basal plate that gives rise to the motor neurons Figure 4-2 B. The neural tube gives rise to three primary vesicles, which develop into five secondary vesicles Figure 4-3 . C. Alpha-fetoprotein AFP is found in the amniotic fluid and maternal serum. It is an indicator of neural tube defects...

Coronal Section Through The Mamillary Bodies Figures 16 and

Mamillary Corpus

The location of the structures shown in the figures should be known. Figure 1-6. Coronal section of the brain at the level of the thalamus, mamillary bodies, and hippocampal formation. Note that the internal capsule lies between the thalamus and the lentiform nucleus. Figure 1-6. Coronal section of the brain at the level of the thalamus, mamillary bodies, and hippocampal formation. Note that the internal capsule lies between the thalamus and the lentiform nucleus. Corpus callosum Caudate...