Going to be covering nerves and synapses this week so here’s a recap!
Soma (cell body) contains the nucleus which produces RNA to support cell functions, + organelles surrounding the nucleus which are mostly made of up endoplasmic reticulum. Supports and maintains the functioning of the neuron.
Dendrites - cellular extensions with many branches ‘dendritic tree’. majority of input occurs via the dendritic spine. The sum of all excitatory (neuron fires) or inhibitory (prevents firing) signals determines whether the neuron fires or not. If firing the action potential is transmitted down the axon.
Axon - fine, cable-like projection that can extend thousands of times the diameter of the soma in length. The axon carries nerve signals away from the soma (and also carries some types of information back to it). Can undergo branching - communication with target cells.
Axon hillock - where the axon emerges from the soma. the part of the neuron that has the greatest density of voltage-dependent sodium channels - therefore the most easily excited part of the neuron and the spike initiation zone for the axon - most negative action potential threshold. Can also receive input from other neurons.
Axon terminal where neurotransmitters are released into the synaptic cleft to signal the next neuron
Myelin is a fatty material that wraps around axons and increases the speed of electrical transmission between neurons. It is broken up by nodes of Ranvier, between which electrical impulses jump. Myelin is produced by schwann cells in the PNS and oligodendrocytes in the CNS.
Classes of neurons
Sensory neurons bring information into the CNS so it can be processed.
Motor neurons get information from other neurons and convey commands to muscles, organs and glands.
Interneurons,found only in the CNS, connect one neuron to another.
Types of neuron
Multipolar neurons have one axon and many dendritic branches. These carry signals from the central nervous system to other parts of the body eg muscles and glands.
Unipolar neurons are also known as sensory neurons. They have one axon and one dendrite with branches. Pass signals from the outside of the body, such as touch, along to the central nervous system.
Bipolar neurons have one axon and one dendrite branch. They pass signals from one neuron to the next inside the central nervous system.
Pyramidal neurons have one axon and two main dendrite branches. These cells pass signals inside the brain and tell the muscles to move.
Purkinje neurons are found in the cerebellum, controlling balance, coordination, and timing of actions. They have one axon and a dense and complicated dendrite arrangement.
This wasn’t requests but I’ve seen these circulating around in the romance prompts department and compiled my favorites to share with you. I did not create these, so I shall not take credit, so the sources of these prompts are linked at the bottom of this post. Go check them out!
“I need you to make out with me. Don’t worry though, it’s for science.”
Character A discovers something Character B has given them way back.
Characters gave each other a promise when they were children and they wonder whether it’s still valid.
When parting, Characters agreed to meet at a certain place at a certain time in a certain number of years.
Character A receives a message that Character B, whom they haven’t seen in years, has been seriously injured.
“We’re not just friends and you fucking know it.”
“It killed me to see you with him.”
“See the eyes they’re making at each other? It’s going as planned.”
“I know they didn’t need my help, but honestly, I personally think they totally do.”
A and B are best friends. A is applying a new flavor of chapstick.“Can I try it? I wanna have a taste,” B asks curiously.“Sure, it’s coconut cream-” A starts to reply, but before they can finish, B kisses A on the lips.
“I know what you want.” “Stop.” “It’s me, isn’t it? Go on, sweetheart. Say it.” “Stop.” “Denying doesn’t help your case much. I can see it in how you look at me.”
Character A hadn’t noticed but their sweet, funny, goofy best friend,Character B, was kind of hot, especially since they’ve been on this fitness kick.
Imagine person A is hardcore crushing on B, and fantasizes about their relationship so much they often refer to the both of them as a couple and say “I love you” at the end of their phone calls accidentally
“Stupid fucking hair, stupid fucking smile, they won’t stop staring at me in that way and they– the way they talk, they’re such a flirt I mean do they honestly think I like them?!??!??”*A makes a sound of astonishment* *B’s ranting is cut midway*“You didn’t see anything!!!!!!” Yells B indignantly as they run out of the room
“We might as well have been dating the whole time.”
“I can finally say I’m dating my best friend.”
“You already met my family, so this saves you a traumatizing experience.”
“Hardly anything changed. I’m actually relieved.”
Since the night you reached out and took my hand, three things have happened.
“It’s not like I like you or anything! … Okay, well- maybe I do.”