• Keine Ergebnisse gefunden

1.4 Evolutionary development of the nervous system

N/A
N/A
Protected

Academic year: 2021

Aktie "1.4 Evolutionary development of the nervous system"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Volltext

(1)

9 Biology, Ms. Mayfield

1.4 Evolutionary development of the nervous system

As animals became more complex and

sophisticated over the process of evolution, so did their nervous systems. This is due to several factors, among them the development of sensory organs such as eyes and ears.

Task:

Read through the information on the three organisms displayed and look at the pictures.

Discuss with your neighbours:

a) What are the most important differences in the nervous system between these three animals?

b) Explain why these changes occurred

1) Jellyfish:

- No front or back side, only top and bottom - No sight, hearing, smell or taste

- Touch-sensitive tentacles

3) Insect:

- Front and back as well as top and bottom - Fully fledged senses

Complex eyes, antennae and taste receptors in “head” region Sensory bristles in each segment as

important touch receptors

Taste, touch and light/dark receptors situated in “head”-region

2) Earthworm:

- Front and back as well as top and bottom - No sight or hearing

- Touch, taste, gravitation and rudimentary light/dark recognition

Referenzen

ÄHNLICHE DOKUMENTE

At the cellular level, cytokine expression in GFP positive cells was increased compared to non-activated (GFP-) T cells, but no differences were observed among the different

α -Neurexins are expressed essentially in all structures of the brain (Ullrich et al., 1995), whereas the expression patterns of Nph1 and Nph3 are highly localized and not uniform

Neuron populations analyzed included all those in which biological effects of either growth factor had been documented before: midbrain dopaminergic neurons, hindbrain serotonergic

Vti1b has been shown to be overlapped with markers for Golgi and TGN, endosomes, vesicles and tubules in the TGN [Advani et al., 1998; Kreykenbohm et al., 2002] which is in line

The tissue distribution of the antibody staining overlapped exten- sively with X-Gal staining in Wfs1 bgal/bgal mice and with endogenous Wfs1 expression pattern in Wfs1 +/bgal

The generation of multiple neurons and secondary progenitor cells from RG cells is tightly controlled by orientation of the mitotic spindle during cell division, which influences

In summary, transcellular NO-cGMP signaling from the expanding limb tissue to the Ti1 neurons may orchestrate the development of the rather complex pioneer pathway by providing

The size and complexity of PC dendritic trees is negatively modulated by Nogo-A (Box1-B), and PCs in Nogo-A KO mice exhibit a reduced intrinsic excitability (Box1-C). Nogo