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Zhou Xuzhong stated: Zhang Jingyue once pointed out that individuals with insufficient blood in the Taiyang (Greater Yang) meridian often present with symptoms such as upward deviation of the eyes and opisthotonos (backward arching of the body). Secular physicians erroneously label this condition as "Jingfeng" (Convulsive Disorder). This is incorrect. The Taiyang meridian originates from the inner canthus, ascends to the forehead, descends along the posterior neck to the dorsal spine, and terminates at the little toe of the foot. In cases where blood deficiency fails to nourish the meridians, the invasion of Cold pathogen inevitably causes contraction and spasm of the vessels, which is a natural physiological response. Unaware of this mechanism, common practitioners frequently administer phlegm-resolving and wind-extinguishing formulas, thereby depleting the patient's blood essence. Is this not contrary to medical principles? This represents Zhang Jingyue's unique insight.

I recall a past case involving Zhang Naiyuan, aged five or six, who was extremely emaciated. One day, while sitting with others, she suddenly collapsed into an opisthotonic posture, claiming to see ghosts upstairs. Her eyes were rolling, perceiving only white and not black. Pediatricians gathered and treated her for "Jingfeng" without success for three days. Upon examination, her bones were prominent and tendons were visible, clearly indicating Blood deficiency in the Taiyang meridian. Furthermore, the old building represented dry wood, and ghosts belong to Yin pathogens; thus, the etiology was determined to be Cold damaging the Ying (Nutritive) level. Following Zhang Jingyue’s advice, after consultation with Mr. Daoweng, we prescribed Danggui Sini Tang (Angelica Decoction for Reversal Cold) from the Jueyin (Terminal Yin) chapter as the primary formula. After just one dose, the black pupil became slightly visible, and the opisthotonic posture improved. Three consecutive doses resulted in recovery.

Another case involved my relative-in-law, Gao Moumou. In winter, while warming himself by a stove, he suddenly experienced spasmodic pain in the back muscles, with his head and feet bent backward, cold extremities, and eyelids retracted upward unable to close. We used the same formula, doubling the dosage of Danggui (Radix Angelicae Sinensis), prepared in a large decoction. He recovered after one dose. This demonstrates that Mr. Zhang’s refutation of the "Jingfeng" diagnosis is indeed correct, and that Taiyang Jing (Spasm) presents differently depending on whether there is Blood deficiency and physical weakness.

Jing (Spasm) is categorized into Gang Jing (Rigid Spasm) and Rou Jing (Flexible Spasm). Gang Jing is characterized by absence of sweating, whereas Rou Jing presents with sweating. Children rarely suffer from Gang Jing but frequently from Rou Jing. Given their thin skin and loose cunli (interstices/pores), they cannot tolerate strong diaphoretic methods for releasing the exterior. Therefore, only muscle-relieving methods for treating Jing should be employed. Although the *Jin Gui Yao Lue* (Essential Prescriptions from the Golden Cabinet) should be the primary reference, its formulas are difficult for me to apply arbitrarily and often misunderstood by the public. Consequently, the selected references herein include Li Dongyuan’s (Haizang) five formulas, one from *Jin Gui*, one miscellaneous selection, and the attached formula for Blood-deficient Cold invading the Taiyang Jing, serving as standards for infantile Jing. As for adapting to changing circumstances, this relies on the profound understanding of later generations; how dare I remain rigid?