Proprioceptive reflex interactions with central motor rhythms in the isolated thoracic ganglion of the shore crab

1991 ◽  
Vol 168 (4) ◽  
pp. 445-459 ◽  
Author(s):  
Steward I. Head ◽  
Brian M. H. Bush
Keyword(s):  
Thoracic Ganglion ◽  
Shore Crab ◽  
Proprioceptive Reflex

A Peripheral Arterial O2-Sensitive Pathway to the Respiratory Oscillator of the Shore Crab Carcinus Maenas

1990 ◽  
Vol 148 (1) ◽  
pp. 181-199
Author(s):  
H. ZINEBI ◽  
J. SIMMERS ◽  
J. P. TRUCHOT
Keyword(s):  
Metabolic Response ◽  
Carcinus Maenas ◽  
Thoracic Ganglion ◽  
Arterial System ◽  
Shore Crab ◽  
Almitrine Bismesylate ◽  
Ventilatory Responses ◽  
Cerebral Ganglia ◽  
Water Oxygen ◽  
Peripheral Arterial

Experiments on whole crab, Carcinus maenas, as well as on two types of isolated perfused preparationswere performed to locate the origin of the O2 chemosensitivity which drives hyperventilation in hypoxia and hypoventilation in hyperoxia. Electromyographic recordings from the scaphognathite muscles confirmed the existence of strong ventilatory responses in the whole animal exposed to various water oxygen levels. Furthermore, surgical section of the circumoesophageal connectivesdid not suppress these responses, thereby excluding the cerebral ganglia as the only site or relay for the O2 chemosensitivity. In semi-isolated preparations in which the thoracic ganglion and anterior arterial system were perfused by saline at various PO2 values, extracellular recordings of the motor output in the peripheral ventilatory nerves showed respiratory responses qualitatively similar, but quantitatively weaker, than those observed in the whole animal. Theseresponses were suppressed by bilateral section of the ventilatory nerves or ligation of the anterior sternal artery. In perfused preparations of the completely isolated thoracic ganglion, respiratory frequency was reduced under hypoxia. This is consistent with a purely metabolic response and excludes a central O2 chemosensitivity at the level of the respiratory oscillator itself. We conclude that a population of peripheral O2-sensitive chemoreceptors is present within the arterial systemin the ventral anterior region, probably around the scaphognathites. These receptors are reversibly stimulated by potassiumcyanide, lobeline and almitrine bismesylate, as also are peripheral O2 chemoreceptors in vertebrates.

PROPRIOCEPTIVE INPUT FROM TWO BASAL JOINT STRETCH RECEPTORS TO LEG MOTONEURONES IN THE ISOLATED THORACIC GANGLION OF THE SHORE CRAB

1992 ◽  
Vol 163 (1) ◽  
pp. 187-208
Author(s):  
STEWART I. HEAD ◽  
BRIAN M.H. BUSH
Keyword(s):  
Motor Nerve ◽  
Carcinus Maenas ◽  
Thoracic Ganglion ◽  
Shore Crab ◽  
Chordotonal Organ ◽  
Leg Muscles ◽  
Receptor Organ ◽  
Motor Nerves

The reflex effects and interactions of two proprioceptors upon motoneurones supplying the four basal leg muscles of the shore crab Carcinus maenas have been studied in a new in vitro preparation consisting of the thoracic-coxal muscle receptor organ (TCMRO) and the coxo-basal chordotonal organ (CBCO) isolated together with the whole thoracic ganglion complex to which they were still connected by their afferent nerves. Each receptor strand was stimulated mechanically, while recording intracellularly from motoneurones in the ganglion, and extracellularly from the cut motor nerves innervating the promotor and remotor muscles of the thoracic-coxal (T—C) joint and the levator and depressor muscles of the coxo-basal (C—B) joint. Stretch of the TCMRO evoked reflex firing in several units in the promotor motor nerve, confirming previous studies. In addition to this ‘intrajoint’ reflex, however, TCMRO stretch also elicited ‘interjoint’ reflex responses in motoneurones of both the levator and depressor muscles. Similarly, stretch and release of the CBCO produced intrajoint resistance reflexes in levator and depressor motoneurones, respectively, as well as interjoint reflexes in promotor and remotor motoneurones. In general, the CBCO produced stronger reflex effects in all four motor nerves than did the TCMRO. Intracellular recordings from individual motoneurones of all four muscles revealed that the majority of them received convergent input from both proprioceptors. The importance of such convergent input in vivo is discussed

Effects of handling during experimental procedures on stress indices in the green shore crab, Carcinus maenas (L)

2021 ◽  
Vol 54 (2) ◽  
pp. 65-85
Author(s):  
Charlotte H. Wilson ◽  
Sarah J. Nancollas ◽  
Molly L. Rivers ◽  
John I. Spicer ◽  
Iain J. McGaw
Keyword(s):  
Carcinus Maenas ◽  
Shore Crab ◽  
Stress Indices

Cannibalism as a potential factor affecting recruitment of the invasive Asian shore crab Hemigrapsus sanguineus

2021 ◽  
Vol 168 (4) ◽  
Author(s):  
Laura C. Crane ◽  
Nancy J. O’Connor
Keyword(s):  
Shore Crab ◽  
Hemigrapsus Sanguineus ◽  
Potential Factor ◽  
Asian Shore Crab

Air Breathing by the Purple Shore Crab, Hemigrapsus nudus (Dana). II. Respiratory Gas and Acid-Base Status in Response to Emersion

1996 ◽  
Vol 69 (4) ◽  
pp. 806-838 ◽  
Author(s):  
S. Morris ◽  
P. Greenaway ◽  
B. R. McMahon
Keyword(s):  
Shore Crab ◽  
Acid Base ◽  
Air Breathing ◽  
Acid Base Status

Biochemical responses of the shore crab (Carcinus maenas) in a eutrophic and metal-contaminated coastal system (Óbidos lagoon, Portugal)

2009 ◽  
Vol 72 (5) ◽  
pp. 1471-1480 ◽  
Author(s):  
Patrícia Pereira ◽  
Hilda de Pablo ◽  
Maria Dulce Subida ◽  
Carlos Vale ◽  
Mário Pacheco
Keyword(s):  
Carcinus Maenas ◽  
Shore Crab ◽  
Coastal System ◽  
Biochemical Responses

Learning and the Role of Cue Reinforcement in the Shell Cracking Behaviour of the Shore Crab: Carcinus Maenas (L)

1989 ◽  
Vol 18 (1-3) ◽  
pp. 141-153 ◽  
Author(s):  
N.J. Abby-Kalio
Keyword(s):  
Carcinus Maenas ◽  
Shore Crab

Hemocyanin synthesis during hypo-osmotic stress in the shore crab Carcinus maenas (L.)

1979 ◽  
Vol 63 (2) ◽  
pp. 207-214 ◽  
Author(s):  
W.R. Boone ◽  
E. Schoffeniels
Keyword(s):  
Osmotic Stress ◽  
Carcinus Maenas ◽  
Shore Crab

Mechanisms of copper toxicity in the shore crab, Carcinus maenas

1992 ◽  
Vol 114 (2) ◽  
pp. 253-257 ◽  
Author(s):  
Jan Ivan Hansen ◽  
Tariq Mustafa ◽  
Michael Depledge
Keyword(s):  
Carcinus Maenas ◽  
Copper Toxicity ◽  
Shore Crab
Sign in / Sign up

Export Citation Format

Share Document