Pain and Nociceptors

Nociceptors are sensory processes that signal pain, they are found in most body tissues, including skin, bone, muscles, most internal organs, blood vessels, and heart. Basically everywhere except the brain How do they work?  When a nociceptors membrane is bent or stretched, mechanical ion gated channels open up creating action potentials. Well say, can anything … Continue reading Pain and Nociceptors


Somatosensory Cortex

Most complex somatosensory processing happens at the cerebral cortex Most of the cortex dealing with the somatic sensory system is located in the parietal lobe. Brodmanns area (3b) is now known as primary somatosensory cortex (S1) So essentially S1=3b Why is Brodmanns are 3b (S1) the primary somatiosensory cortex for touch? Receives direct dense input … Continue reading Somatosensory Cortex

Dorsal Column – Medial Lemniscal Pathway

Dorsal Column - carries information about tactile sensation (or pressure on skin) and position of the limb The Dorsal Column lemniscal Pathway goes as such: Touch information ascends through dorsal column ---> Then goes through to the dorsal column nuclei (where the dorsal column axons are terminated) located in the medulla (note: this is also … Continue reading Dorsal Column – Medial Lemniscal Pathway

Primary Afferent

Primary Afferent Axons (Aα) Aβ, Aδ, C Aβ, Aδ - Mediates touch sensitive The  Aβ axons bring information about touch to the dorsal horn and branch ---> One branch synapses (makes a connection) in deep part of dorsal horn on secondary order sensory neurons (neurons that recieve sensory input from primary afferents) Aδ, C - fibers mediate … Continue reading Primary Afferent

Somatic Sensation – Charlie bit my finger

The somatic system allows for us to feel different things such as being touched, pain, and temperature. It takes a physical stimuli such as pressure on skin, position of a joint or muscle, chemicals, and so on. The somatic sensory system has receptors all through out the body that specifically deal with the sense of … Continue reading Somatic Sensation – Charlie bit my finger