Anatomy – Page 4

48. Sensory pathways (I)

First-order sensory neurons from the limbs and trunk have their cell bodies in the substantia gelatinosa of the spinal cord. (T/F)
Lateral spinothalamic tract conveys sensations of touch and pressure. (T/F)
Anterior spinothalamic tract conveys sensations of pain and temperature. (T/F)
Gracile nuclei are located lateraly to the cuneate nuclei. (T/F)
Second-order sensory neurons with cell bodies in the gracile and cuneate nuclei cross the midline and ascend in the thalamic radiation. (T/F)
Third-order sensory neurons project from the thalamus to contralateral cerebral cortex. (T/F)

The corticospinal tract is a motor pathway starting at the cortex that terminates on motor neurons in the brainstem or spinal cord and is involved in the control of motor functions of the body?
About 80% of corticospinal neurons originate in the primary motor cortex?
Pyramidal cells of Betz are the largest neurons in the central nervous system?
Lateral corticospinal tract appears on transverse section of the spinal cord as an oval area in front of the posterior column and medial to the posterior spinocerebellar tract?
All the fibers of the lateral corticospinal tract cross the midline in the medulla oblongata and control the limbs and digits?
The anterior corticospinal tract becomes smaller as it descends, ending at the level of the mid-thoracic spinal cord?

Is a C – shaped structure that lies on the lateral side of the thalamus?
Stria terminalis and thalamostriate vein lie between thalamus and caudate nucleus?
Together with putamen it forms the ventral striatum?
Its head forms the floor of the anterior horn of the lateral ventricle?
Caudate nucleus nucleus has motor and behavioral functions?
It is heavily innervated by serotoninergic neurons from substantia nigra?

Sensation of pain is lost contralateraly to the lesion, beginning one or two segments below the lesion?
Proprioception is lost ipsilateraly to the lesion, beginning one or to segments below the lesion?
Flaccid paralysis is present ipsilateraly to the lesion and below the level of the lesion?
Spastic paralysis is present contralateraly to the lesion, at the level of the lesion?
Sensation of vibration is lost ipsilateraly to the lesion?
Sensation of temperature is lost on the both sides, one to two segments below the level of the lesion?

Innervates only one single muscle of the eye, the lateral rectus muscle?
Axons from the abducens nerve loop around the facial motor nucleus, creating the facial colliculus that is visible on the floor of the fourth ventricle?
Besides the motor neurons, which directly innervate ipsilateral lateral rectus muscle via the abducens nerve, abducens nucleus contains also interneurons, which project to the contralateral oculomotor nucleus and cause conjugate movement (adduction) of the contralateral eye?
Besides the motor neurons, which directly innervate ipsilateral medial rectus muscle via the oculomotor nerve, oculomotor nerve nucleus contains also interneurons, which project to the contralateral abducens nucleus and cause conjugate movement (abduction) of the contralateral eye?
A lesion to the nucleus of the abducens nerve causes inability to move the eyes together in the direction of the side with the lesion?
In peripheral abducens palsy, the contralateral eye is slightly adducted because of the unopposed tonic action of the medial rectus muscle?